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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 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;
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