Skip to content

Transform a function into a sequence of functions each accepting a single argument.

License

Notifications You must be signed in to change notification settings

stdlib-js/utils-curry-right

About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

curryRight

NPM version Build Status Coverage Status

Transform a function into a sequence of functions each accepting a single argument.

Installation

npm install @stdlib/utils-curry-right

Alternatively,

  • To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
  • If you are using Deno, visit the deno branch (see README for usage intructions).
  • For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var curryRight = require( '@stdlib/utils-curry-right' );

curryRight( fcn[, arity][, thisArg] )

Transforms a function into a sequence of functions each accepting a single argument.

function add( x, y ) {
    return x + y;
}

var fcn = curryRight( add );

var sum = fcn( 2 )( 3 );
// returns 5

By default, arity is equal to fcn.length. For functions without explicit parameters, provide an arity argument.

function add() {
    return arguments[ 0 ] + arguments[ 1 ];
}

var fcn = curryRight( add, 2 );

var sum = fcn( 2 )( 3 );
// returns 5

To specify the curried function execution context, provide a thisArg argument.

var obj = {
    'name': 'Ada',
    'greet': function greet( word1, word2 ) {
        return word1 + ' ' + word2 + ', ' + this.name + '!';
    }
};

var fcn = curryRight( obj.greet, obj );

var str = fcn( 'there' )( 'Hello' );
// returns 'Hello there, Ada!'

The function supports providing both an arity and execution context.

var obj = {
    'name': 'Ada',
    'greet': function greet() {
        return arguments[ 0 ] + ' ' + arguments[ 1 ] + ', ' + this.name + '!';
    }
};

var fcn = curryRight( obj.greet, 2, obj );

var str = fcn( 'there' )( 'Hello' );
// returns 'Hello there, Ada!'

Notes

  • Until return value resolution, each invocation returns a new partially applied curry function.

    function add( x, y, z ) {
        return x + y + z;
    }
    
    var fcn = curryRight( add );
    
    var s0 = fcn( 1 )( 2 )( 3 );
    // returns 6
    
    s0 = fcn( -1 )( -2 )( -3 );
    // returns -6
    
    s0 = fcn( 10 )( 20 )( 30 );
    // returns 60
    
    // Return a partially applied curry function:
    var f1 = fcn( 3 );
    
    var s1 = f1( 4 )( 5 );
    // returns 12
    
    s1 = f1( 6 )( 7 );
    // returns 16
    
    s1 = f1( 8 )( 9 );
    // returns 20
    
    // Return a partially applied curry function:
    var f2 = fcn( 4 )( 5 );
    
    var s2 = f2( 6 );
    // returns 15
    
    s2 = f2( 70 );
    // returns 79
    
    s2 = f2( 700 );
    // returns 709
  • The difference between this function and curry is the order in which arguments are applied. This function applies arguments starting from the right.

Examples

var curryRight = require( '@stdlib/utils-curry-right' );

var fcn;
var out;
var i;

function add( x, y, z, w, t, s ) {
    return x + y + z + w + t + s;
}

fcn = curryRight( add );
out = fcn;
for ( i = 0; i < add.length; i++ ) {
    out = out( i*10 );
}
console.log( out );

See Also


Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

Chat


License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.