67 lines
1.7 KiB
JavaScript
67 lines
1.7 KiB
JavaScript
/**
|
|
* @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 isFunction = require( '@stdlib/assert/is-function' );
|
|
|
|
|
|
// MAIN //
|
|
|
|
/**
|
|
* Invokes a function while a test condition is true.
|
|
*
|
|
* @param {Function} predicate - function which indicates whether to continue invoking a function
|
|
* @param {Function} fcn - function to invoke
|
|
* @param {*} [thisArg] - execution context for the invoked function
|
|
* @throws {TypeError} first argument must be a function
|
|
* @throws {TypeError} second argument must be a function
|
|
*
|
|
* @example
|
|
* function predicate( i ) {
|
|
* return ( i < 5 );
|
|
* }
|
|
*
|
|
* function beep( i ) {
|
|
* console.log( 'beep: %d', i );
|
|
* }
|
|
*
|
|
* whilst( predicate, beep );
|
|
*/
|
|
function whilst( predicate, fcn, thisArg ) {
|
|
var i;
|
|
if ( !isFunction( predicate ) ) {
|
|
throw new TypeError( 'invalid argument. First argument must be a function. Value: `'+predicate+'`.' );
|
|
}
|
|
if ( !isFunction( fcn ) ) {
|
|
throw new TypeError( 'invalid argument. Second argument must be a function. Value: `'+fcn+'`.' );
|
|
}
|
|
i = 0;
|
|
while ( predicate( i ) ) {
|
|
fcn.call( thisArg, i );
|
|
i += 1;
|
|
}
|
|
}
|
|
|
|
|
|
// EXPORTS //
|
|
|
|
module.exports = whilst;
|