119 lines
3.2 KiB
JavaScript
119 lines
3.2 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isFunction = require( '@stdlib/assert/is-function' );
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var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive;
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// MAIN //
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/**
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* Transforms a curried function into a function invoked with multiple arguments.
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*
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* @param {Function} fcn - curried function
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* @param {PositiveInteger} [arity] - number of parameters
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* @param {*} [thisArg] - evaluation context
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* @throws {TypeError} first argument must be a function
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* @throws {TypeError} `arity` argument must be a positive integer
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* @returns {Function} uncurried function
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*
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* @example
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* function addX( x ) {
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* return function addY( y ) {
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* return x + y;
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* };
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* }
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*
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* var add = uncurry( addX );
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*
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* var sum = add( 2, 3 );
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* // returns 5
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*/
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function uncurry( fcn, arity, thisArg ) {
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var context;
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var len;
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if ( !isFunction( fcn ) ) {
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throw new TypeError( 'invalid argument. First argument must be a function. Value: `'+fcn+'`.' );
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}
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if ( arguments.length < 2 ) {
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len = null;
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}
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else if ( arguments.length > 2 ) {
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len = arity;
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context = thisArg;
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if ( !isPositiveInteger( len ) ) {
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throw new TypeError( 'invalid argument. Arity argument must be a positive integer. Value: `'+len+'`.' );
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}
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}
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else if ( isPositiveInteger( arity ) ) {
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len = arity;
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}
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else {
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len = null;
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context = arity;
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}
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return uncurried;
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/**
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* Uncurried function.
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*
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* @private
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* @param {...*} args - arguments
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* @throws {Error} if arity is set, must provide expected number of input arguments
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* @throws {Error} configured arity must be compatible with curried function
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* @throws {Error} if arity is not set, number of arguments must be compatible with curried function
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* @returns {*} function result
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*/
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function uncurried() {
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var f;
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var i;
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f = fcn;
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if ( len ) {
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if ( len > arguments.length ) {
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throw new Error( 'insufficient input arguments. Expected '+len+' argument(s) and only received '+arguments.length+' argument(s).' );
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}
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for ( i = 0; i < len; i++ ) {
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if ( isFunction( f ) ) {
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f = f.call( context, arguments[ i ] );
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} else {
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throw new Error( 'invalid invocation. The configured arity exceeds the number of possible curried function invocations. Expected: '+len+'. Actual: '+i+'.' );
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}
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}
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return f;
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}
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for ( i = 0; i < arguments.length; i++ ) {
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if ( isFunction( f ) ) {
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f = f.call( context, arguments[ i ] );
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} else {
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throw new Error( 'invalid invocation. Number of arguments exceeds the number of possible curried function invocations. Expected: '+arguments.length+'. Actual: '+i+'.' );
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}
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}
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return f;
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}
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}
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// EXPORTS //
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module.exports = uncurry;
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