67 lines
1.7 KiB
JavaScript
67 lines
1.7 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isFunction = require( '@stdlib/assert/is-function' );
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// MAIN //
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/**
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* Invokes a function while a test condition is true.
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*
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* @param {Function} predicate - function which indicates whether to continue invoking a function
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* @param {Function} fcn - function to invoke
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* @param {*} [thisArg] - execution context for the invoked function
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* @throws {TypeError} first argument must be a function
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* @throws {TypeError} second argument must be a function
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*
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* @example
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* function predicate( i ) {
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* return ( i < 5 );
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* }
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*
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* function beep( i ) {
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* console.log( 'beep: %d', i );
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* }
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*
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* whilst( predicate, beep );
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*/
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function whilst( predicate, fcn, thisArg ) {
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var i;
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if ( !isFunction( predicate ) ) {
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throw new TypeError( 'invalid argument. First argument must be a function. Value: `'+predicate+'`.' );
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}
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if ( !isFunction( fcn ) ) {
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throw new TypeError( 'invalid argument. Second argument must be a function. Value: `'+fcn+'`.' );
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}
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i = 0;
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while ( predicate( i ) ) {
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fcn.call( thisArg, i );
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i += 1;
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}
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}
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// EXPORTS //
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module.exports = whilst;
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