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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 isCollection = require( '@stdlib/assert/is-collection' );
var isFunction = require( '@stdlib/assert/is-function' );
// MAIN //
/**
* While a test condition is true, invokes a function once for each element in a collection.
*
* ## Notes
*
* - The condition is evaluated **after** executing the function to invoke; thus, the provided function **always** executes at least once.
* - If provided an empty collection, the function invokes the provided function with the collection index set to `undefined`.
*
*
* @param {Collection} collection - input collection
* @param {Function} fcn - function to invoke
* @param {Function} predicate - function which indicates whether to continue iterating over a collection
* @param {*} [thisArg] - execution context for the applied function
* @throws {TypeError} first argument must be a collection
* @throws {TypeError} second argument must be a function
* @throws {TypeError} third argument must be a function
* @returns {Collection} input collection
*
* @example
* function predicate( v, index, collection ) {
* return ( v === v );
* }
*
* function log( v, index, collection ) {
* console.log( '%s: %d', index, v );
* }
*
* var arr = [ 1, 2, 3, 4, NaN, 5 ];
*
* doWhileEach( arr, log, predicate );
*/
function doWhileEach( collection, fcn, predicate, thisArg ) {
var len;
var i;
if ( !isCollection( collection ) ) {
throw new TypeError( 'invalid argument. First argument must be a collection. Value: `'+collection+'`.' );
}
if ( !isFunction( fcn ) ) {
throw new TypeError( 'invalid argument. Second argument must be a function. Value: `'+fcn+'`.' );
}
if ( !isFunction( predicate ) ) {
throw new TypeError( 'invalid argument. Third argument must be a function. Value: `'+predicate+'`.' );
}
len = collection.length;
if ( len === 0 ) {
fcn.call( thisArg, void 0, void 0, collection );
len = collection.length;
if ( len === 0 ) {
return collection;
}
}
i = 0;
do {
fcn.call( thisArg, collection[ i ], i, collection );
i += 1;
len = collection.length; // ...account for dynamically resizing a collection
} while (
i < len &&
predicate( collection[ i-1 ], i-1, collection )
);
return collection;
}
// EXPORTS //
module.exports = doWhileEach;
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