time-to-botec

Benchmark sampling in different programming languages
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do_while_each.js (2889B)

      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 isCollection = require( '@stdlib/assert/is-collection' );
     24 var isFunction = require( '@stdlib/assert/is-function' );
     25 
     26 
     27 // MAIN //
     28 
     29 /**
     30 * While a test condition is true, invokes a function once for each element in a collection.
     31 *
     32 * ## Notes
     33 *
     34 * -   The condition is evaluated **after** executing the function to invoke; thus, the provided function **always** executes at least once.
     35 * -   If provided an empty collection, the function invokes the provided function with the collection index set to `undefined`.
     36 *
     37 *
     38 * @param {Collection} collection - input collection
     39 * @param {Function} fcn - function to invoke
     40 * @param {Function} predicate - function which indicates whether to continue iterating over a collection
     41 * @param {*} [thisArg] - execution context for the applied function
     42 * @throws {TypeError} first argument must be a collection
     43 * @throws {TypeError} second argument must be a function
     44 * @throws {TypeError} third argument must be a function
     45 * @returns {Collection} input collection
     46 *
     47 * @example
     48 * function predicate( v, index, collection ) {
     49 *     return ( v === v );
     50 * }
     51 *
     52 * function log( v, index, collection ) {
     53 *     console.log( '%s: %d', index, v );
     54 * }
     55 *
     56 * var arr = [ 1, 2, 3, 4, NaN, 5 ];
     57 *
     58 * doWhileEach( arr, log, predicate );
     59 */
     60 function doWhileEach( collection, fcn, predicate, thisArg ) {
     61 	var len;
     62 	var i;
     63 	if ( !isCollection( collection ) ) {
     64 		throw new TypeError( 'invalid argument. First argument must be a collection. Value: `'+collection+'`.' );
     65 	}
     66 	if ( !isFunction( fcn ) ) {
     67 		throw new TypeError( 'invalid argument. Second argument must be a function. Value: `'+fcn+'`.' );
     68 	}
     69 	if ( !isFunction( predicate ) ) {
     70 		throw new TypeError( 'invalid argument. Third argument must be a function. Value: `'+predicate+'`.' );
     71 	}
     72 	len = collection.length;
     73 	if ( len === 0 ) {
     74 		fcn.call( thisArg, void 0, void 0, collection );
     75 		len = collection.length;
     76 		if ( len === 0 ) {
     77 			return collection;
     78 		}
     79 	}
     80 	i = 0;
     81 	do {
     82 		fcn.call( thisArg, collection[ i ], i, collection );
     83 		i += 1;
     84 		len = collection.length; // ...account for dynamically resizing a collection
     85 	} while (
     86 		i < len &&
     87 		predicate( collection[ i-1 ], i-1, collection )
     88 	);
     89 	return collection;
     90 }
     91 
     92 
     93 // EXPORTS //
     94 
     95 module.exports = doWhileEach;