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* @license Apache-2.0
*
* Copyright (c) 2021 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 isFunction = require( '@stdlib/assert/is-function' );
var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var isCollection = require( '@stdlib/assert/is-collection' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns a function that applies specified arguments to a provided function.
*
* @param {Function} fcn - input function
* @param {NonNegativeIntegerArray} indices - argument indices
* @param {*} [thisArg] - function context
* @throws {TypeError} first argument must be a function
* @throws {TypeError} second argument must be an array of nonnegative integers
* @returns {Function} function wrapper
*
* @example
* function foo( a, b ) {
* return [ a, b ];
* }
*
* var bar = pickArguments( foo, [ 0, 2 ] );
*
* var out = bar( 1, 2, 3 );
* // returns [ 1, 3 ]
*/
function pickArguments( fcn, indices, thisArg ) {
var fcns;
var idx;
var v;
var i;
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a function. Value: `%s`.', fcn ) );
}
if ( !isCollection( indices ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be an array-like object containing nonnegative integers. Value: `%s`.', indices ) );
}
idx = [];
for ( i = 0; i < indices.length; i++ ) {
v = indices[ i ];
if ( !isNonNegativeInteger( v ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be an array-like object containing nonnegative integers. Value: `%s`.', indices ) );
}
idx.push( v );
}
fcns = [ nullary, unary, binary, ternary, quaternary, quinary ];
return ( idx.length < fcns.length ) ? fcns[ idx.length ] : nary;
/**
* Invokes a nullary function.
*
* @private
* @param {...*} args - arguments
* @returns {*} return value
*/
function nullary() {
return fcn.call( thisArg );
}
/**
* Invokes a unary function.
*
* @private
* @param {...*} args - arguments
* @returns {*} return value
*/
function unary() {
return fcn.call( thisArg, arguments[ idx[0] ] );
}
/**
* Invokes a binary function.
*
* @private
* @param {...*} args - arguments
* @returns {*} return value
*/
function binary() {
return fcn.call( thisArg, arguments[ idx[0] ], arguments[ idx[1] ] );
}
/**
* Invokes a ternary function.
*
* @private
* @param {...*} args - arguments
* @returns {*} return value
*/
function ternary() {
return fcn.call( thisArg, arguments[ idx[0] ], arguments[ idx[1] ], arguments[ idx[2] ] ); // eslint-disable-line max-len
}
/**
* Invokes a quaternary function.
*
* @private
* @param {...*} args - arguments
* @returns {*} return value
*/
function quaternary() {
return fcn.call( thisArg, arguments[ idx[0] ], arguments[ idx[1] ], arguments[ idx[2] ], arguments[ idx[3] ] ); // eslint-disable-line max-len
}
/**
* Invokes a quinary function.
*
* @private
* @param {...*} args - arguments
* @returns {*} return value
*/
function quinary() {
return fcn.call( thisArg, arguments[ idx[0] ], arguments[ idx[1] ], arguments[ idx[2] ], arguments[ idx[3] ], arguments[ idx[4] ] ); // eslint-disable-line max-len
}
/**
* Invokes an n-ary function.
*
* @private
* @param {...*} args - arguments
* @returns {*} return value
*/
function nary() {
var args;
var i;
args = [];
for ( i = 0; i < arguments.length; i++ ) {
args.push( arguments[ idx[i] ] );
}
return fcn.apply( thisArg, args );
}
}
// EXPORTS //
module.exports = pickArguments;
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