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* @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' );
var format = require( '@stdlib/string/format' );
// 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( format( 'invalid argument. First argument must be a function. Value: `%s`.', predicate ) );
}
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a function. Value: `%s`.', fcn ) );
}
i = 0;
while ( predicate( i ) ) {
fcn.call( thisArg, i );
i += 1;
}
}
// EXPORTS //
module.exports = whilst;
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