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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.

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funseq

NPM version Build Status Coverage Status

Function sequence.

Usage

import funseq from 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-function-sequence@esm/index.mjs';

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

<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">

import funseq from 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-function-sequence@esm/index.mjs';

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

</script>
</body>
</html>

See Also


Notice

This package is part of stdlib, a standard library 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.

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License

See LICENSE.

Copyright

Copyright © 2016-2025. The Stdlib Authors.

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