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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 curried function into a function invoked with multiple arguments.
*
* @param {Function} fcn - curried function
* @param {PositiveInteger} [arity] - number of parameters
* @param {*} [thisArg] - evaluation context
* @throws {TypeError} first argument must be a function
* @throws {TypeError} `arity` argument must be a positive integer
* @returns {Function} uncurried function
*
* @example
* function addX( x ) {
* return function addY( y ) {
* return x + y;
* };
* }
*
* var add = uncurry( addX );
*
* var sum = add( 2, 3 );
* // returns 5
*/
function uncurry( 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 = null;
}
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 = null;
context = arity;
}
return uncurried;
/**
* Uncurried function.
*
* @private
* @param {...*} args - arguments
* @throws {Error} if arity is set, must provide expected number of input arguments
* @throws {Error} configured arity must be compatible with curried function
* @throws {Error} if arity is not set, number of arguments must be compatible with curried function
* @returns {*} function result
*/
function uncurried() {
var f;
var i;
f = fcn;
if ( len ) {
if ( len > arguments.length ) {
throw new Error( format( 'insufficient arguments. Expected %u argument(s) and only received %u argument(s).', len, arguments.length ) );
}
for ( i = 0; i < len; i++ ) {
if ( isFunction( f ) ) {
f = f.call( context, arguments[ i ] );
} else {
throw new Error( format( 'invalid invocation. The configured arity exceeds the number of possible curried function invocations. Expected: `%u`. Actual: `%u`.', len, i ) );
}
}
return f;
}
for ( i = 0; i < arguments.length; i++ ) {
if ( isFunction( f ) ) {
f = f.call( context, arguments[ i ] );
} else {
throw new Error( format( 'invalid invocation. Number of arguments exceeds the number of possible curried function invocations. Expected: `%u`. Actual: `%u`.', arguments.length, i ) );
}
}
return f;
}
}
// EXPORTS //
module.exports = uncurry;
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