Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 18x 18x 41x 16x 16x 9x 9x 7x 7x 14x 14x 14x 14x 14x 41x 7x 7x 7x 7x 14x 14x 14x 14x 12x 12x 14x 14x 41x 41x 14x 14x 14x 14x 14x 14x 14x 14x 14x 14x 14x 24x 24x 24x 4x 4x 4x 4x 4x 20x 20x 20x 20x 24x 14x 14x 14x 14x 14x 14x 14x 14x 24x 24x 24x 4x 4x 4x 4x 4x 20x 20x 20x 20x 24x 14x 14x 14x 14x 14x 14x 14x 14x 14x 4x 4x 2x 2x 2x 2x 2x 2x 2x 2x 4x 14x 14x 14x 14x 14x 14x 14x 14x 2x 1x 1x 1x 2x 41x 5x 5x 5x 5x 5x | /**
* @license Apache-2.0
*
* Copyright (c) 2018 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 setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var isFunction = require( '@stdlib/assert/is-function' );
var isCollection = require( '@stdlib/assert/is-collection' );
var isAccessorArray = require( '@stdlib/array/base/assert/is-accessor-array' );
var iteratorSymbol = require( '@stdlib/symbol/iterator' );
var accessorGetter = require( '@stdlib/array/base/accessor-getter' );
var getter = require( '@stdlib/array/base/getter' );
var dtype = require( '@stdlib/array/dtype' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns an iterator which iterates from right to left over each element in an array-like object.
*
* ## Notes
*
* - For dynamic array resizing, the only behavior made intentionally consistent with iterating from left to right is when elements are pushed onto the beginning (end) of an array. In other words, iterating from left to right combined with `[].push()` is consistent with iterating from right to left combined with `[].unshift()`.
*
* @param {Collection} src - input value
* @param {Function} [mapFcn] - function to invoke for each iterated value
* @param {*} [thisArg] - execution context
* @throws {TypeError} first argument must be an array-like object
* @throws {TypeError} second argument must be a function
* @returns {Iterator} iterator
*
* @example
* var iter = array2iteratorRight( [ 1, 2, 3, 4 ] );
*
* var v = iter.next().value;
* // returns 4
*
* v = iter.next().value;
* // returns 3
*
* v = iter.next().value;
* // returns 2
*
* // ...
*/
function array2iteratorRight( src ) {
var thisArg;
var iter;
var FLG;
var fcn;
var len;
var get;
var dt;
var i;
if ( !isCollection( src ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an array-like object. Value: `%s`.', src ) );
}
if ( arguments.length > 1 ) {
fcn = arguments[ 1 ];
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a function. Value: `%s`.', fcn ) );
}
thisArg = arguments[ 2 ];
}
len = src.length;
i = len;
// Create an iterator protocol-compliant object:
iter = {};
if ( fcn ) {
setReadOnly( iter, 'next', next1 );
} else {
setReadOnly( iter, 'next', next2 );
}
setReadOnly( iter, 'return', end );
// If an environment supports `Symbol.iterator`, make the iterator iterable:
if ( iteratorSymbol ) {
setReadOnly( iter, iteratorSymbol, factory );
}
// Resolve an accessor for retrieving array elements (e.g., to accommodate `Complex64Array`, etc):
dt = dtype( src );
if ( isAccessorArray( src ) ) {
get = accessorGetter( dt );
} else {
get = getter( dt );
}
return iter;
/**
* Returns an iterator protocol-compliant object containing the next iterated value.
*
* @private
* @returns {Object} iterator protocol-compliant object
*/
function next1() {
i += src.length - len - 1; // accounts for a dynamic array
len = src.length;
if ( FLG || i < 0 ) {
FLG = true;
return {
'done': true
};
}
return {
'value': fcn.call( thisArg, get( src, i ), i, src ),
'done': false
};
}
/**
* Returns an iterator protocol-compliant object containing the next iterated value.
*
* @private
* @returns {Object} iterator protocol-compliant object
*/
function next2() {
i += src.length - len - 1; // accounts for a dynamic array
len = src.length;
if ( FLG || i < 0 ) {
FLG = true;
return {
'done': true
};
}
return {
'value': get( src, i ),
'done': false
};
}
/**
* Finishes an iterator.
*
* @private
* @param {*} [value] - value to return
* @returns {Object} iterator protocol-compliant object
*/
function end( value ) {
FLG = true;
if ( arguments.length ) {
return {
'value': value,
'done': true
};
}
return {
'done': true
};
}
/**
* Returns a new iterator.
*
* @private
* @returns {Iterator} iterator
*/
function factory() {
if ( fcn ) {
return array2iteratorRight( src, fcn, thisArg );
}
return array2iteratorRight( src );
}
}
// EXPORTS //
module.exports = array2iteratorRight;
|