@stdlib/utils-function-sequence NPM

funseq

Function sequence.

Installation

npm install @stdlib/utils-function-sequence

Usage

var funseq = require( '@stdlib/utils-function-sequence' );

funseq( ...fcn )

Returns a pipeline function. Starting from the left, the pipeline function evaluates each function and passes the result as an argument to the next function. The result of the rightmost function is the result of the whole.

function a( x ) {
    return 2 * x;
}

function b( x ) {
    return x + 3;
}

function c( x ) {
    return x / 5;
}

var f = funseq( a, b, c );

var z = f( 6 ); // ((2*x)+3)/5
// returns 3

Only the leftmost function is explicitly permitted to accept multiple arguments. All other functions are evaluated as unary functions.

function a( x, y ) {
    return (x*5) + (y*3);
}

function b( r ) {
    return r + 12;
}

var f = funseq( a, b );

var z = f( 4, 6 );
// returns 50

Notes

The function will throw if provided fewer than 2 input arguments.
The difference between this function and compose is that this function evaluates input arguments from left-to-right, rather than right-to-left.

Examples

var funseq = require( '@stdlib/utils-function-sequence' );

function a( x, y ) {
    return x * y;
}

function b( z ) {
    return z + 5;
}

function c( r ) {
    return r / 10;
}

var f = funseq( a, b, c );

var v = f( 5, 3 );
// returns 2

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.