pickArguments

Create a function that invokes a provided function with specified arguments.

Usage

var pickArguments = require( '@stdlib/utils/pick-arguments' );

pickArguments( fcn, indices[, thisArg] )

Returns a function that invokes a provided function with specified arguments.

function foo( a, b ) {
    return [ a, b ];
}

var bar = pickArguments( foo, [ 0, 2 ] );

var out = bar( 1, 2, 3 );
// returns [ 1, 3 ]

To set the this context when invoking the provided function, provide a thisArg.

function Foo() {
    this.x = 1;
    this.y = 2;
}

Foo.prototype.scale = function scale( a, b ) {
    return [ this.x*a, this.y*b ];
};

var ctx = {
    'x': 10,
    'y': 20
};

var foo = new Foo();

var bar = pickArguments( foo.scale, [ 0, 2 ], ctx );

var out = bar( 1, 2, 3 );
// returns [ 10, 60 ]

Examples

var filledarrayBy = require( '@stdlib/array/filled-by' );
var add = require( '@stdlib/math/base/ops/add' );
var pickArguments = require( '@stdlib/utils/pick-arguments' );

function fill( i ) {
    return i;
}

// Create a data array:
var x = filledarrayBy( 10, 'float64', fill );

// Compute the sum of consecutive elements...
var f;
var i;
for ( i = 1; i < x.length; i++ ) {
    f = pickArguments( add, [ i-1, i ] );
    console.log( 'sum(x_%d, x_%d) = %d', i-1, i, f.apply( null, x ) );
}