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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 //
/**
* Returns a function of smaller arity by partially applying arguments.
*
* @param {Function} fcn - function to partially apply
* @param {...*} [args] - arguments to partially apply
* @throws {TypeError} first argument must be a function
* @returns {Function} partially applied function
*
* @example
* function add( x, y ) {
* return x + y;
* }
*
* var add2 = papply( add, 2 );
*
* var sum = add2( 3 );
* // returns 5
*/
function papply( fcn ) {
var pargs;
var i;
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a function. Value: `%s`.', fcn ) );
}
pargs = new Array( arguments.length-1 );
for ( i = 1; i < arguments.length; i++ ) {
pargs[ i-1 ] = arguments[ i ];
}
return papplied;
/**
* Partially applied function.
*
* @private
* @param {...*} [args] - function arguments
* @returns {*} partially applied function result
*/
function papplied() {
var args;
var j;
args = pargs.slice();
for ( j = 0; j < arguments.length; j++ ) {
args.push( arguments[ j ] );
}
return fcn.apply( null, args );
}
}
// EXPORTS //
module.exports = papply;
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