funseq

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