time-to-botec

Benchmark sampling in different programming languages
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curry_right.js (2580B)

      1 /**
      2 * @license Apache-2.0
      3 *
      4 * Copyright (c) 2018 The Stdlib Authors.
      5 *
      6 * Licensed under the Apache License, Version 2.0 (the "License");
      7 * you may not use this file except in compliance with the License.
      8 * You may obtain a copy of the License at
      9 *
     10 *    http://www.apache.org/licenses/LICENSE-2.0
     11 *
     12 * Unless required by applicable law or agreed to in writing, software
     13 * distributed under the License is distributed on an "AS IS" BASIS,
     14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15 * See the License for the specific language governing permissions and
     16 * limitations under the License.
     17 */
     18 
     19 'use strict';
     20 
     21 // MODULES //
     22 
     23 var isFunction = require( '@stdlib/assert/is-function' );
     24 var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive;
     25 
     26 
     27 // MAIN //
     28 
     29 /**
     30 * Transforms a function into a sequence of functions each accepting a single argument.
     31 *
     32 * @param {Function} fcn - function to curry
     33 * @param {PositiveInteger} [arity=fcn.length] - number of parameters
     34 * @param {*} [thisArg] - evaluation context
     35 * @throws {TypeError} first argument must be a function
     36 * @throws {TypeError} `arity` argument must be a positive integer
     37 * @returns {Function} curry function
     38 *
     39 * @example
     40 * function add( x, y ) {
     41 *     return x + y;
     42 * }
     43 *
     44 * var f = curryRight( add );
     45 *
     46 * var sum = f( 2 )( 3 );
     47 * // returns 5
     48 */
     49 function curryRight( fcn, arity, thisArg ) {
     50 	var context;
     51 	var len;
     52 	if ( !isFunction( fcn ) ) {
     53 		throw new TypeError( 'invalid argument. First argument must be a function. Value: `' + fcn + '`.' );
     54 	}
     55 	if ( arguments.length < 2 ) {
     56 		len = fcn.length;
     57 	}
     58 	else if ( arguments.length > 2 ) {
     59 		len = arity;
     60 		context = thisArg;
     61 		if ( !isPositiveInteger( len ) ) {
     62 			throw new TypeError( 'invalid argument. Arity argument must be positive integer. Value: `' + len + '`.' );
     63 		}
     64 	}
     65 	else if ( isPositiveInteger( arity ) ) {
     66 		len = arity;
     67 	}
     68 	else {
     69 		len = fcn.length;
     70 		context = arity;
     71 	}
     72 	return createCurried( [] );
     73 
     74 	/**
     75 	* Returns a curry function.
     76 	*
     77 	* @private
     78 	* @param {Array} args - arguments
     79 	* @returns {Function} curry function
     80 	*/
     81 	function createCurried( args ) {
     82 		return curried;
     83 
     84 		/**
     85 		* Curry function.
     86 		*
     87 		* @private
     88 		* @param {*} v - curried function parameter
     89 		* @returns {(Function|*)} partially applied curry function or curried function result
     90 		*/
     91 		function curried( v ) {
     92 			var cargs = args.slice();
     93 			cargs.unshift( v );
     94 			if ( cargs.length < len ) {
     95 				return createCurried( cargs );
     96 			}
     97 			return fcn.apply( context, cargs );
     98 		}
     99 	}
    100 }
    101 
    102 
    103 // EXPORTS //
    104 
    105 module.exports = curryRight;