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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 from the right.
*
* @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 say( text, name ) {
* return text + ', ' + name + '.';
* }
*
* var toGrace = papplyRight( say, 'Grace Hopper' );
*
* var str = toGrace( 'Hello' );
* // returns 'Hello, Grace Hopper.'
*
* str = toGrace( 'Thank you' );
* // returns 'Thank you, Grace Hopper.'
*/
function papplyRight( fcn ) {
var pargs;
var len;
var i;
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a function. Value: `%s`.', fcn ) );
}
len = arguments.length - 1;
pargs = new Array( len );
for ( i = 1; i < arguments.length; i++ ) {
pargs[ i-1 ] = arguments[ i ];
}
return pappliedRight;
/**
* Partially applied function.
*
* @private
* @param {...*} [args] - function arguments
* @returns {*} partially applied function result
*/
function pappliedRight() {
var nargs;
var args;
var j;
nargs = arguments.length;
args = new Array( len+nargs );
for ( j = 0; j < args.length; j++ ) {
if ( j >= nargs ) {
args[ j ] = pargs[ j-nargs ];
} else {
args[ j ] = arguments[ j ];
}
}
return fcn.apply( null, args );
}
}
// EXPORTS //
module.exports = papplyRight;
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