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Create a function that invokes a provided function according to a predicate function.
To use in Observable,
filterArguments = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-filter-arguments@umd/browser.js' )To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var filterArguments = require( 'path/to/vendor/umd/utils-filter-arguments/index.js' )To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/utils-filter-arguments@umd/browser.js"></script>If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.filterArguments;
})();
</script>Returns a function that invokes a provided function according to a predicate function.
function foo( a, b ) {
return [ a, b ];
}
function predicate( v ) {
return ( v !== 2 );
}
var bar = filterArguments( foo, predicate );
var out = bar( 1, 2, 3 );
// returns [ 1, 3 ]The predicate function is provided the following arguments:
- value: argument value.
- index: argument index.
To set the this context when invoking the input function, provide a thisArg.
function predicate( v ) {
return ( v !== 2 );
}
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 = filterArguments( foo.scale, predicate, ctx );
var out = bar( 1, 2, 3 );
// returns [ 10, 60 ]- Only those arguments in which the
predicatefunction returns a truthy value are applied to a provided function.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-filled-by@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/math-base-ops-add@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/utils-filter-arguments@umd/browser.js"></script>
<script type="text/javascript">
(function () {
function fill( i ) {
return i;
}
function factory( i, j ) {
return predicate;
function predicate( value, index ) {
return ( i <= index ) && ( index < j );
}
}
// Create a data array:
var x = filledarrayBy( 10, 'float64', fill );
// Compute the sum of consecutive elements...
var f;
var i;
for ( i = 0; i < x.length-1; i++ ) {
f = filterArguments( add, factory( i, i+2 ) );
console.log( 'sum(x_%d, x_%d) = %d', i, i+1, f.apply( null, x ) );
}
})();
</script>
</body>
</html>@stdlib/utils-mask-arguments: create a function that invokes a provided function according to an argument mask.@stdlib/utils-reject-arguments: create a function that invokes a provided function according to a predicate function.@stdlib/utils-reorder-arguments: create a function that invokes a provided function with reordered arguments.@stdlib/utils-reverse-arguments: create a function that invokes a provided function with arguments in reverse order.
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.
See LICENSE.
Copyright © 2016-2024. The Stdlib Authors.
