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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 isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive;
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Transforms a function into a sequence of functions each accepting a single argument.
*
* @param {Function} fcn - function to curry
* @param {PositiveInteger} [arity=fcn.length] - number of parameters
* @param {*} [thisArg] - evaluation context
* @throws {TypeError} first argument must be a function
* @throws {TypeError} first argument must be a function having at least one parameter
* @throws {TypeError} `arity` argument must be a positive integer
* @returns {Function} curry function
*
* @example
* function add( x, y ) {
* return x + y;
* }
*
* var f = curryRight( add );
*
* var sum = f( 2 )( 3 );
* // returns 5
*/
function curryRight( fcn, arity, thisArg ) {
var context;
var len;
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a function. Value: `%s`.', fcn ) );
}
if ( arguments.length < 2 ) {
len = fcn.length;
if ( !isPositiveInteger( len ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a function having at least one parameter. Value: `%s`.', len ) );
}
} else if ( arguments.length > 2 ) {
len = arity;
context = thisArg;
if ( !isPositiveInteger( len ) ) {
throw new TypeError( format( 'invalid argument. Arity argument must be a positive integer. Value: `%s`.', len ) );
}
} else if ( isPositiveInteger( arity ) ) {
len = arity;
} else {
len = fcn.length;
if ( !isPositiveInteger( len ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a function having at least one parameter. Value: `%s`.', len ) );
}
context = arity;
}
return createCurried( [] );
/**
* Returns a curry function.
*
* @private
* @param {Array} args - arguments
* @returns {Function} curry function
*/
function createCurried( args ) {
return curried;
/**
* Curry function.
*
* @private
* @param {*} v - curried function parameter
* @returns {(Function|*)} partially applied curry function or curried function result
*/
function curried( v ) {
var cargs = args.slice();
cargs.unshift( v );
if ( cargs.length < len ) {
return createCurried( cargs );
}
return fcn.apply( context, cargs );
}
}
}
// EXPORTS //
module.exports = curryRight;
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