85 lines
1.9 KiB
JavaScript
85 lines
1.9 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 isArray = require( './../../../is-array' );
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// MAIN //
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/**
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* Returns a function which tests if every element in an array passes a test condition.
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*
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* @param {Function} predicate - function to apply
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* @throws {TypeError} must provide a function
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* @returns {Function} an array function
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*
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* @example
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* var isOdd = require( '@stdlib/assert/is-odd' );
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*
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* var arr1 = [ 1, 3, 5, 7 ];
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* var arr2 = [ 3, 5, 8 ];
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*
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* var validate = arrayfcn( isOdd );
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*
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* var bool = validate( arr1 );
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* // returns true
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*
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* bool = validate( arr2 );
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* // returns false
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*/
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function arrayfcn( predicate ) {
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if ( typeof predicate !== 'function' ) {
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throw new TypeError( 'invalid argument. Must provide a function. Value: `' + predicate + '`.' );
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}
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return every;
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/**
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* Tests if every element in an array passes a test condition.
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*
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* @private
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* @param {*} value - value to test
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* @returns {boolean} boolean indicating whether a value is an array for which all elements pass a test condition
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*/
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function every( value ) {
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var len;
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var i;
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if ( !isArray( value ) ) {
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return false;
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}
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len = value.length;
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if ( len === 0 ) {
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return false;
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}
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for ( i = 0; i < len; i++ ) {
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if ( predicate( value[ i ] ) === false ) {
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return false;
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}
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}
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return true;
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}
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}
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// EXPORTS //
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module.exports = arrayfcn;
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