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* @license Apache-2.0
*
* Copyright (c) 2025 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var setReadOnlyAccessor = require( '@stdlib/utils/define-nonenumerable-read-only-accessor' );
var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var isObject = require( '@stdlib/assert/is-object' );
var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
var isCollection = require( '@stdlib/assert/is-collection' );
var isFunction = require( '@stdlib/assert/is-function' );
var floor = require( '@stdlib/math/base/special/floor' );
var min = require( '@stdlib/math/base/special/min' );
var max = require( '@stdlib/math/base/special/max' );
var isArray = require( '@stdlib/assert/is-array' );
var format = require( '@stdlib/string/format' );
var iteratorSymbol = require( '@stdlib/symbol/iterator' );
var hasToStringTag = require( '@stdlib/assert/has-tostringtag-support' );
// MAIN //
/**
* Creates a new Float16Array constructor.
*
* @constructor
* @param {(number|Array|ArrayBuffer|TypedArray)} input - input data or buffer
* @param {NonNegativeInteger} [byteOffset=0] - byte offset
* @param {NonNegativeInteger} [length] - number of elements
* @throws {TypeError} must provide valid input
*/
function Float16Array( input, byteOffset, length ) {
var i;
var len;
var offset;
byteOffset = byteOffset || 0;
if ( isNonNegativeInteger( input ) ) {
this._buffer = new Uint16Array( input );
} else if ( input instanceof ArrayBuffer ) {
offset = Number( byteOffset );
if ( !isNonNegativeInteger( offset ) ) {
throw new RangeError( format( 'invalid argument. Byte offset must be a non-negative integer. Value: `%s`.', byteOffset ) );
}
if ( arguments.length > 2 ) {
if ( !isNonNegativeInteger( length ) ) {
throw new RangeError( format( 'invalid argument. Length must be a non-negative integer. Value: `%s`.', length ) );
}
len = length;
} else {
len = ( input.byteLength - offset ) / 2;
}
this._buffer = new Uint16Array( input, offset, len );
} else if ( isArray( input ) ) {
this._buffer = new Uint16Array( input.length );
for ( i = 0; i < input.length; i++ ) {
this._buffer[ i ] = Float16Array.toFloat16( input[ i ] );
}
} else if ( isCollection( input ) ) {
this._buffer = new Uint16Array( input.length );
for ( i = 0; i < input.length; i++ ) {
this._buffer[ i ] = Float16Array.toFloat16( input[ i ] );
}
} else {
throw new TypeError( format( 'invalid argument. Must provide a number, Array, ArrayBuffer, or typed array. Value: `%s`.', input ) );
}
this.length = this._buffer.length;
}
setReadOnly( Float16Array, 'name', 'Float16Array' );
setReadOnly( Float16Array, 'BYTES_PER_ELEMENT', 2 );
/**
* Get the underlying `ArrayBuffer`.
*
* @name buffer
* @memberof Float16Array.prototype
* @readonly
* @type {ArrayBuffer}
*/
setReadOnlyAccessor( Float16Array.prototype, 'buffer', function getBuffer() {
return this._buffer.buffer;
});
/**
* Get the total number of bytes in the `Float16Array`.
*
* @name byteLength
* @memberof Float16Array.prototype
* @readonly
* @type {NonNegativeInteger}
*/
setReadOnlyAccessor( Float16Array.prototype, 'byteLength', function getByteLength() {
return this._buffer.byteLength;
});
/**
* Get the byte offset within the underlying `ArrayBuffer`.
*
* @name byteOffset
* @memberof Float16Array.prototype
* @readonly
* @type {NonNegativeInteger}
*/
setReadOnlyAccessor( Float16Array.prototype, 'byteOffset', function getByteOffset() {
return this._buffer.byteOffset;
});
/**
* Size in bytes of each element.
*
* @name BYTES_PER_ELEMENT
* @memberof Float16Array.prototype
* @readonly
* @type {PositiveInteger}
*/
setReadOnlyAccessor( Float16Array.prototype, 'BYTES_PER_ELEMENT', function getBytesPerElement() {
return 2;
});
/**
* Returns the default string tag.
*
* @name [Symbol.toStringTag]
* @memberof Float16Array.prototype
* @readonly
* @type {string}
*/
var symbolToStringTag = hasToStringTag() ? Symbol.toStringTag : '__toStringTag__';
setReadOnlyAccessor( Float16Array.prototype, symbolToStringTag, function getToStringTag() {
return 'Float16Array';
});
/**
* Copy a sequence of array elements within the array.
*
* @name copyWithin
* @memberof Float16Array.prototype
* @type {Function}
* @param {integer} target - target index
* @param {integer} start - start index
* @param {integer} [end] - end index (exclusive)
* @throws {TypeError} if any index is not an integer
* @throws {RangeError} if any index is out of bounds
* @returns {Float16Array} modified array
*/
setReadOnly( Float16Array.prototype, 'copyWithin', function copyWithin( target, start, end ) {
var to;
var from;
var final;
var count;
var i;
if ( !isInteger( target ) ) {
throw new TypeError( format( 'invalid argument. Target index must be an integer. Value: `%s`.', target ) );
}
if ( !isInteger( start ) ) {
throw new TypeError( format( 'invalid argument. Start index must be an integer. Value: `%s`.', start ) );
}
if ( arguments.length > 2 && !isInteger( end ) ) {
throw new TypeError( format( 'invalid argument. End index must be an integer when provided. Value: `%s`.', end ) );
}
to = ( target < 0 ) ? this.length + target : target;
from = ( start < 0 ) ? this.length + start : start;
final = ( arguments.length < 3 ) ? this.length : ( end < 0 ? this.length + end : end );
if ( to < 0 || to > this.length ) {
throw new RangeError( format( 'invalid argument. Target index is out of bounds. Value: `%s`.', target ) );
}
if ( from < 0 || from > this.length ) {
throw new RangeError( format( 'invalid argument. Start index is out of bounds. Value: `%s`.', start ) );
}
if ( final < 0 || final > this.length ) {
throw new RangeError( format( 'invalid argument. End index is out of bounds. Value: `%s`.', end ) );
}
count = min( final - from, this.length - to );
if ( from < to && to < ( from + count ) ) {
for ( i = count - 1; i >= 0; i-- ) {
this._buffer[ to + i ] = this._buffer[ from + i ];
}
} else {
for ( i = 0; i < count; i++ ) {
this._buffer[ to + i ] = this._buffer[ from + i ];
}
}
return this;
});
/**
* Return an iterator over [index, value] pairs.
*
* @name entries
* @memberof Float16Array.prototype
* @type {Function}
* @returns {Object} Iterator
*/
setReadOnly( Float16Array.prototype, 'entries', function entries() {
var self = this;
var i = 0;
function nextEntries() {
if ( i < self.length ) {
var v = [ i, self.get( i ) ];
i += 1;
return {
value: v,
done: false
};
}
return {
value: void 0,
done: true
};
}
function getEntriesIterator() {
return iterator;
}
var iterator = {
next: nextEntries
};
if ( iteratorSymbol ) {
iterator[ iteratorSymbol ] = getEntriesIterator;
}
return iterator;
});
/**
* Test whether all elements pass the test.
*
* @name every
* @memberof Float16Array.prototype
* @type {Function}
* @param {Function} callback - predicate function
* @param {*} [thisArg] - context
* @returns {boolean} whether all pass
*/
setReadOnly( Float16Array.prototype, 'every', function every( callback, thisArg ) {
var i;
if ( !isFunction( callback ) ) {
throw new TypeError( format( 'invalid argument. Callback must be a function. Value: `%s`.', callback ) );
}
for ( i = 0; i < this.length; i++ ) {
if ( !callback.call( thisArg, this.get( i ), i, this ) ) {
return false;
}
}
return true;
});
/**
* Fill the array with a static value.
*
* @name fill
* @memberof Float16Array.prototype
* @type {Function}
* @param {*} value - value to fill
* @param {integer} [start=0] - start index
* @param {integer} [end=array.length] - end index
* @throws {TypeError} if start or end are not integers
* @returns {Float16Array} modified array
*/
setReadOnly( Float16Array.prototype, 'fill', function fill( value, start, end ) {
var i;
var bits;
var s;
var e;
function createFloat16Getter( index ) {
return function getFloat16Index() {
return this.get( index );
};
}
function createFloat16Setter( index ) {
return function setFloat16Index( val ) {
this.set( index, val );
};
}
if ( arguments.length > 1 && !isInteger( start ) ) {
throw new TypeError( format( 'invalid argument. Start index must be an integer. Value: `%s`.', start ) );
}
if ( arguments.length > 2 && !isInteger( end ) ) {
throw new TypeError( format( 'invalid argument. End index must be an integer when provided. Value: `%s`.', end ) );
}
s = ( arguments.length < 2 ) ? 0 : ( start < 0 ? max( this.length + start, 0 ) : min( start, this.length ) );
e = ( arguments.length < 3 ) ? this.length : ( end < 0 ? max( this.length + end, 0 ) : min( end, this.length ) );
bits = Float16Array.toFloat16( value );
for ( i = s; i < e; i++ ) {
this._buffer[ i ] = bits;
Object.defineProperty( this, i, {
get: createFloat16Getter( i ),
set: createFloat16Setter( i ),
enumerable: true,
configurable: true
});
}
return this;
});
/**
* Creates a new Float16Array with all elements that pass the test implemented by the provided function.
*
* @name filter
* @memberof Float16Array.prototype
* @type {Function}
* @param {Function} callback - function to test each element
* @param {*} [thisArg] - value to use as `this` when executing `callback`
* @throws {TypeError} must provide a function as callback
* @returns {Float16Array} new Float16Array with filtered elements
*/
setReadOnly( Float16Array.prototype, 'filter', function filter( callback, thisArg ) {
var i;
var value;
var result;
if ( !isFunction( callback ) ) {
throw new TypeError( format( 'invalid argument. Callback must be a function. Value: `%s`.', callback ) );
}
result = [];
for ( i = 0; i < this.length; i++ ) {
value = this.get( i );
if ( callback.call( thisArg, value, i, this ) ) {
result.push( value );
}
}
return new Float16Array( result );
});
/**
* Returns the value of the first element that satisfies the provided testing function.
*
* @name find
* @memberof Float16Array.prototype
* @type {Function}
* @param {Function} callback - function to execute on each value
* @param {*} [thisArg] - value to use as `this` when executing `callback`
* @throws {TypeError} must provide a function as callback
* @returns {*} first matching element, or undefined if no match
*/
setReadOnly( Float16Array.prototype, 'find', function find( callback, thisArg ) {
var i;
var value;
if ( !isFunction( callback ) ) {
throw new TypeError( format( 'invalid argument. Callback must be a function. Value: `%s`.', callback ) );
}
for ( i = 0; i < this.length; i++ ) {
value = this.get( i );
if ( callback.call( thisArg, value, i, this ) ) {
return value;
}
}
return void 0;
});
/**
* Returns the index of the first element that satisfies the provided testing function.
*
* @name findIndex
* @memberof Float16Array.prototype
* @type {Function}
* @param {Function} callback - function to execute on each value
* @param {*} [thisArg] - value to use as `this` when executing `callback`
* @throws {TypeError} must provide a function as callback
* @returns {integer} index of found element, or -1 if none found
*/
setReadOnly( Float16Array.prototype, 'findIndex', function findIndexfunction( callback, thisArg ) {
var i;
var value;
if ( !isFunction( callback ) ) {
throw new TypeError( format( 'invalid argument. Callback must be a function. Value: `%s`.', callback ) );
}
for ( i = 0; i < this.length; i++ ) {
value = this.get( i );
if ( callback.call( thisArg, value, i, this ) ) {
return i;
}
}
return -1;
});
/**
* Execute a function for each element of the array.
*
* @name forEach
* @memberof Float16Array.prototype
* @type {Function}
* @param {Function} callback - function to invoke
* @param {*} [thisArg] - context for callback
*/
setReadOnly( Float16Array.prototype, 'forEach', function forEachfunction( callback, thisArg ) {
var i;
if ( !isFunction( callback ) ) {
throw new TypeError( format( 'invalid argument. Callback must be a function. Value: `%s`.', callback ) );
}
for ( i = 0; i < this.length; i++ ) {
callback.call( thisArg, this.get( i ), i, this );
}
});
/**
* Create a new Float16Array from an array-like or iterable object.
*
* @name from
* @memberof Float16Array
* @type {Function}
* @param {*} source - source to convert
* @param {Function} [mapFn] - optional mapping function
* @param {*} [thisArg] - execution context for mapFn
* @returns {Float16Array} new instance
* @throws {TypeError} if source is invalid or mapFn is not a function
*/
setReadOnly( Float16Array, 'from', function from( source, mapFn, thisArg ) {
if ( source === null ) {
throw new TypeError( format( 'invalid argument. Source cannot be null or undefined. Value: %s.', source ) );
}
if ( arguments.length > 1 && !isFunction( mapFn ) ) {
throw new TypeError( format( 'invalid argument. When provided, mapFn must be a function. Value: %s.', mapFn ) );
}
var values = [];
var i = 0;
if ( isCollection( source ) ) {
for ( i = 0; i < source.length; i++ ) {
values.push( source[ i ] );
}
}
else if ( isObject( source ) && isFunction( source[ Symbol.iterator ] ) ) {
var iterator = source[ Symbol.iterator ]();
while ( true ) {
var next = iterator.next();
if ( next.done ) {
break;
}
values.push( next.value );
}
} else {
throw new TypeError( format( 'invalid argument. Source must be iterable or array-like. Value: %s.', source ) );
}
if ( mapFn ) {
for ( i = 0; i < values.length; i++ ) {
values[ i ] = mapFn.call( thisArg, values[ i ], i );
}
}
var result = new Float16Array( values.length );
for ( i = 0; i < values.length; i++ ) {
result.set( i, values[ i ] );
}
return result;
});
/**
* Converts a float16 binary representation to float32.
*
* @name fromFloat16
* @memberof Float16Array
* @type {Function}
* @param {integer} bits - Float16 bit pattern
* @throws {TypeError} must provide a 16-bit unsigned integer
* @returns {number} Float32 value
*/
setReadOnly( Float16Array, 'fromFloat16', function fromFloat16( bits ) {
var sign;
var exponent;
var fraction;
var intView;
var floatView;
var result;
var exp32;
var frac32;
if ( !isNonNegativeInteger( bits ) || bits > 0xFFFF ) {
throw new TypeError( format( 'invalid argument. Must provide a 16-bit unsigned integer. Value: `%s`.', bits ) );
}
sign = ( bits & 0x8000 ) << 16;
exponent = ( bits & 0x7C00 ) >> 10;
fraction = bits & 0x03FF;
intView = new Uint32Array( 1 );
if ( exponent === 0 ) {
if ( fraction === 0 ) {
result = sign;
} else {
exponent = 1;
while ( ( fraction & 0x0400 ) === 0 ) {
fraction <<= 1;
exponent -= 1;
}
fraction &= ~0x0400;
exp32 = 127 - 15 - exponent;
frac32 = fraction << 13;
result = sign | ( exp32 << 23 ) | frac32;
}
} else if ( exponent === 0x1F ) {
result = sign | 0x7F800000 | ( fraction << 13 );
} else {
exp32 = exponent - 15 + 127;
result = sign | ( exp32 << 23 ) | ( fraction << 13 );
}
intView[ 0 ] = result;
floatView = new Float32Array( intView.buffer );
return floatView[ 0 ];
});
/**
* Get a value at a given index.
*
* @name get
* @memberof Float16Array.prototype
* @type {Function}
* @param {NonNegativeInteger} index - array index
* @throws {RangeError} if index is out of bounds
* @returns {number} Float32 value at index
*/
setReadOnly( Float16Array.prototype, 'get', function getfunction( index ) {
if ( !isNonNegativeInteger( index ) || index >= this.length ) {
throw new RangeError( format( 'invalid argument. Index out of bounds. Value: `%s`.', index ) );
}
return Float16Array.fromFloat16( this._buffer[ index ] );
});
/**
* Determines whether the array includes a certain value among its entries.
*
* @name includes
* @memberof Float16Array.prototype
* @type {Function}
* @param {*} searchElement - element to search for
* @param {integer} [fromIndex=0] - index to start the search at
* @throws {TypeError} if fromIndex is not an integer
* @returns {boolean} true if the value is found, false otherwise
*/
setReadOnly( Float16Array.prototype, 'includes', function includes( searchElement, fromIndex ) {
var i;
var start;
if ( arguments.length > 1 && !isInteger( fromIndex ) ) {
throw new TypeError( format( 'invalid argument. FromIndex must be an integer. Value: `%s`.', fromIndex ) );
}
start = ( arguments.length < 2 ) ? 0 : fromIndex;
if ( start < 0 ) {
start = max( this.length + start, 0 );
}
for ( i = start; i < this.length; i++ ) {
if ( this.get( i ) === searchElement ) {
return true;
}
}
return false;
});
/**
* Returns the first index at which a given element can be found in the array, or -1 if it is not present.
*
* @name indexOf
* @memberof Float16Array.prototype
* @type {Function}
* @param {*} searchElement - element to locate
* @param {integer} [fromIndex=0] - index to start the search at
* @throws {TypeError} if fromIndex is not an integer
* @returns {integer} index of the element, or -1 if not found
*/
setReadOnly( Float16Array.prototype, 'indexOf', function indexOf( searchElement, fromIndex ) {
var i;
var start;
if ( arguments.length > 1 && !isInteger( fromIndex ) ) {
throw new TypeError( format( 'invalid argument. FromIndex must be an integer. Value: `%s`.', fromIndex ) );
}
start = ( arguments.length < 2 ) ? 0 : fromIndex;
if ( start < 0 ) {
start = max( this.length + start, 0 );
}
for ( i = start; i < this.length; i++ ) {
if ( this.get( i ) === searchElement ) {
return i;
}
}
return -1;
});
/**
* Joins all elements of the Float16Array into a string, separated by a specified separator.
*
* @name join
* @memberof Float16Array.prototype
* @type {Function}
* @param {string} [separator=','] - separator to insert between values
* @returns {string} joined string
*/
setReadOnly( Float16Array.prototype, 'join', function join( separator ) {
var result = '';
var i;
separator = ( arguments.length < 0 ) ? ',' : String( separator );
for ( i = 0; i < this.length; i++ ) {
if ( i > 0 ) {
result += separator;
}
result += String( this.get( i ) );
}
return result;
});
/**
* Return an iterator over indices.
*
* @name keys
* @memberof Float16Array.prototype
* @type {Function}
* @returns {Object} Iterator
*/
setReadOnly( Float16Array.prototype, 'keys', function keys() {
var self = this;
var i = 0;
function nextKeys() {
if ( i < self.length ) {
var v = i;
i += 1;
return {
value: v,
done: false
};
}
return {
value: void 0,
done: true
};
}
function getKeysIterator() {
return iterator;
}
var iterator = {
next: nextKeys
};
if ( iteratorSymbol ) {
iterator[ iteratorSymbol ] = getKeysIterator;
}
return iterator;
});
/**
* Returns the last index at which a given element can be found in the array, or -1 if it is not present.
*
* @name lastIndexOf
* @memberof Float16Array.prototype
* @type {Function}
* @param {*} searchElement - element to locate
* @param {integer} [fromIndex=this.length-1] - index to start the search backwards from
* @throws {TypeError} if fromIndex is not an integer
* @returns {integer} last index of the element, or -1 if not found
*/
setReadOnly( Float16Array.prototype, 'lastIndexOf', function lastIndexOffunction( searchElement, fromIndex ) {
var i;
if ( arguments.length > 1 && !isInteger( fromIndex ) ) {
throw new TypeError( format( 'invalid argument. FromIndex must be an integer. Value: `%s`.', fromIndex ) );
}
i = ( arguments.length > 1 ) ? fromIndex : this.length - 1;
if ( i >= this.length ) {
i = this.length - 1;
}
if ( i < 0 ) {
i = this.length + i;
}
for ( ; i >= 0; i-- ) {
if ( Object.is( this.get( i ), searchElement ) ) {
return i;
}
}
return -1;
});
/**
* Apply a function to each element and return a new Float16Array.
*
* @name map
* @memberof Float16Array.prototype
* @type {Function}
* @param {Function} callback - mapping function
* @param {*} [thisArg] - context for callback
* @returns {Float16Array} mapped array
*/
setReadOnly( Float16Array.prototype, 'map', function mapfunction( callback, thisArg ) {
var result = new Float16Array( this.length );
var i;
var val;
if ( !isFunction( callback ) ) {
throw new TypeError( format( 'invalid argument. Callback must be a function. Value: `%s`.', callback ) );
}
for ( i = 0; i < this.length; i++ ) {
val = callback.call( thisArg, this.get( i ), i, this );
result.set( i, val );
}
return result;
});
/**
* Create a new Float16Array from a variable number of arguments.
*
* @name of
* @memberof Float16Array
* @type {Function}
* @returns {Float16Array} new instance
*/
setReadOnly( Float16Array, 'of', function of() {
var len = arguments.length;
var result = new Float16Array( len );
var i;
for ( i = 0; i < len; i++ ) {
result.set( i, arguments[ i ] );
}
return result;
});
/**
* Reduce the array to a single value (left-to-right).
*
* @name reduce
* @memberof Float16Array.prototype
* @type {Function}
* @param {Function} callback - reducer function
* @param {*} [initialValue] - initial value
* @returns {*} accumulated result
*/
setReadOnly( Float16Array.prototype, 'reduce', function reduce( callback, initialValue ) {
var i;
var acc;
var len;
if ( !isFunction( callback ) ) {
throw new TypeError( format( 'invalid argument. Callback must be a function. Value: `%s`.', callback ) );
}
len = this.length;
if ( arguments.length >= 2 ) {
acc = initialValue;
i = 0;
} else {
if ( len === 0 ) {
throw new TypeError( format( 'invalid operation. Reduce of empty array with no initial value.' ) );
}
acc = this.get( 0 );
i = 1;
}
for ( ; i < len; i++ ) {
acc = callback( acc, this.get( i ), i, this );
}
return acc;
});
/**
* Reduce the array to a single value (right-to-left).
*
* @name reduceRight
* @memberof Float16Array.prototype
* @type {Function}
* @param {Function} callback - reducer function
* @param {*} [initialValue] - initial value
* @returns {*} accumulated result
*/
setReadOnly( Float16Array.prototype, 'reduceRight', function reduceRight( callback, initialValue ) {
var i;
var acc;
var len;
if ( !isFunction( callback ) ) {
throw new TypeError( format( 'invalid argument. Callback must be a function. Value: `%s`.', callback ) );
}
len = this.length;
if ( arguments.length >= 2 ) {
acc = initialValue;
i = len - 1;
} else {
if ( len === 0 ) {
throw new TypeError( format( 'invalid operation. Reduce of empty array with no initial value.' ) );
}
acc = this.get( len - 1 );
i = len - 2;
}
for ( ; i >= 0; i-- ) {
acc = callback( acc, this.get( i ), i, this );
}
return acc;
});
/**
* Reverse the array in place.
*
* @name reverse
* @memberof Float16Array.prototype
* @type {Function}
* @returns {Float16Array} modified array
*/
setReadOnly( Float16Array.prototype, 'reverse', function reverse() {
var i;
var j;
var tmp;
var mid = floor( this.length / 2 );
for ( i = 0; i < mid; i++ ) {
j = this.length - 1 - i;
tmp = this._buffer[ i ];
this._buffer[ i ] = this._buffer[ j ];
this._buffer[ j ] = tmp;
}
return this;
});
/**
* Set a value at a given index, or copy values from an array-like source.
*
* @name set
* @memberof Float16Array.prototype
* @type {Function}
* @param {(NonNegativeInteger|ArrayLike)} indexOrArray - index or source array
* @param {*} [value] - value to set or offset if copying
* @throws {RangeError} index or offset out of bounds
* @throws {TypeError} invalid arguments
*/
setReadOnly( Float16Array.prototype, 'set', function set( indexOrArray, value ) {
var i;
var len;
var offset;
var srcVal;
if ( isNonNegativeInteger( indexOrArray ) ) {
if ( indexOrArray >= this.length ) {
throw new RangeError( format( 'invalid argument. Index must be a nonnegative integer less than the array length. Value: `%s`.', indexOrArray ) );
}
this._buffer[ indexOrArray ] = Float16Array.toFloat16( value );
return;
}
offset = ( arguments.length > 1 ) ? Number( value ) : 0;
if ( !isNonNegativeInteger( offset ) || offset > this.length ) {
throw new RangeError( format( 'invalid argument. Offset must be a nonnegative integer less than or equal to the array length. Value: `%s`.', offset ) );
}
if ( isArray( indexOrArray ) || isCollection( indexOrArray ) ) {
len = min( indexOrArray.length, this.length - offset );
for ( i = 0; i < len; i++ ) {
srcVal = isFunction( indexOrArray.get ) ? indexOrArray.get( i ) : indexOrArray[ i ];
this._buffer[ offset + i ] = Float16Array.toFloat16( srcVal );
}
return;
}
throw new TypeError( format( 'invalid argument. Must provide index and value or source and offset. Value: `%s`.', indexOrArray ) );
});
/**
* Returns a shallow copy of a portion of the array.
*
* @name slice
* @memberof Float16Array.prototype
* @type {Function}
* @param {integer} [start=0] - start index
* @param {integer} [end=array.length] - end index (exclusive)
* @throws {TypeError} if start or end is not an integer
* @returns {Float16Array} new subarray
*/
setReadOnly( Float16Array.prototype, 'slice', function slice( start, end ) {
var len = this.length;
var i;
var count;
var relativeStart;
var relativeEnd;
var result;
if ( arguments.length > 0 && !isInteger( start ) ) {
throw new TypeError( format( 'invalid argument. Start index must be an integer. Value: `%s`.', start ) );
}
if ( arguments.length > 1 && !isInteger( end ) ) {
throw new TypeError( format( 'invalid argument. End index must be an integer. Value: `%s`.', end ) );
}
relativeStart = ( arguments.length < 1 ) ? 0 : ( start < 0 ? max( len + start, 0 ) : min( start, len ) );
relativeEnd = ( arguments.length < 2 ) ? len : ( end < 0 ? max( len + end, 0 ) : min( end, len ) );
count = max( relativeEnd - relativeStart, 0 );
result = new Float16Array( count );
for ( i = 0; i < count; i++ ) {
result.set( i, this.get( relativeStart + i ) );
}
return result;
});
/**
* Test whether at least one element passes the test.
*
* @name some
* @memberof Float16Array.prototype
* @type {Function}
* @param {Function} callback - predicate function
* @param {*} [thisArg] - context
* @returns {boolean} whether at least one passes
*/
setReadOnly( Float16Array.prototype, 'some', function some( callback, thisArg ) {
var i;
var value;
if ( !isFunction( callback ) ) {
throw new TypeError( format( 'invalid argument. Callback must be a function. Value: `%s`.', callback ) );
}
for ( i = 0; i < this.length; i++ ) {
value = this.get( i );
if ( callback.call( thisArg, value, i, this ) ) {
return true;
}
}
return false;
});
/**
* Sort the array in place.
*
* @name sort
* @memberof Float16Array.prototype
* @type {Function}
* @param {Function} [compareFn] - optional comparison function
* @throws {TypeError} if compareFn is not a function
* @returns {Float16Array} sorted array
*/
setReadOnly( Float16Array.prototype, 'sort', function sort( compareFn ) {
var values = [];
var i;
var j;
if ( arguments.length > 0 && !isFunction( compareFn ) ) {
throw new TypeError( format( 'invalid argument. Comparison function must be a function. Value: `%s`.', compareFn ) );
}
function getComparator( compareFn ) {
return function compareFloat16( a, b ) {
if ( compareFn ) {
return compareFn( a, b );
}
if ( a !== a ) {
return 1;
}
if ( b !== b ) {
return -1;
}
return a - b;
};
}
for ( i = 0; i < this.length; i++ ) {
values.push( this.get( i ) );
}
values.sort( getComparator( compareFn ) );
for ( j = 0; j < this.length; j++ ) {
this.set( j, values[ j ] );
}
return this;
});
/**
* Returns a new Float16Array view on the same buffer, for the specified range.
*
* @name subarray
* @memberof Float16Array.prototype
* @type {Function}
* @param {integer} [begin=0] - start index
* @param {integer} [end=this.length] - end index
* @returns {Float16Array} new Float16Array
*/
setReadOnly( Float16Array.prototype, 'subarray', function subarray( begin, end ) {
var len = this.length;
var start = ( arguments.length < 1 ) ? 0 : ( begin < 0 ? max( len + begin, 0 ) : min( begin, len ) );
var finish = ( arguments.length < 2 ) ? len : ( end < 0 ? max( len + end, 0 ) : min( end, len ) );
var count = max( finish - start, 0 );
var result = new Float16Array( count );
for ( var i = 0; i < count; i++ ) {
result.set( i, this.get( start + i ) );
}
return result;
});
/**
* Converts a float32 number to a float16 (binary) representation.
*
* @name toFloat16
* @memberof Float16Array
* @type {Function}
* @param {*} val - Float32 value (coerced if not number)
* @returns {integer} Float16 bit pattern
*/
setReadOnly( Float16Array, 'toFloat16', function toFloat16( val ) {
var num = Number( val );
var floatView = new Float32Array( 1 );
var intView = new Uint32Array( floatView.buffer );
var sign;
var exponent;
var fraction;
var exp;
var frac;
var x;
floatView[ 0 ] = num;
x = intView[ 0 ];
sign = ( x >> 16 ) & 0x8000;
exponent = ( ( x >> 23 ) & 0xff ) - 127;
fraction = x & 0x7fffff;
if ( exponent <= -15 ) {
if ( exponent < -24 ) {
return sign;
}
return sign | ( ( ( fraction | 0x800000 ) >> ( -exponent - 1 ) ) >> 13 );
}
if ( exponent >= 16 ) {
return sign | 0x7c00;
}
exp = exponent + 15;
frac = fraction >> 13;
return sign | ( exp << 10 ) | frac;
});
/**
* Return an iterator over values.
*
* @name values
* @memberof Float16Array.prototype
* @type {Function}
* @returns {Object} Iterator
*/
setReadOnly( Float16Array.prototype, 'values', function values() {
var self = this;
var i = 0;
var iterator = {
next: function nextValues() {
if ( i < self.length ) {
var v = self.get( i );
i += 1;
return {
value: v,
done: false
};
}
return {
value: void 0,
done: true
};
}
};
if ( iteratorSymbol ) {
iterator[ iteratorSymbol ] = function getValuesIterator() {
return iterator;
};
}
return iterator;
});
// EXPORTS //
module.exports = Float16Array;
|