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