@stdlib/assert-is-method NPM

isMethod

Test if an object has a specified method name.

Installation

npm install @stdlib/assert-is-method

Usage

var isMethod = require( '@stdlib/assert-is-method' );

isMethod( value, property )

Returns a boolean indicating if a value has a specified own method name.

function noop() {
    // Example function...
}

var value = {
    'beep': noop
};

var bool = isMethod( value, 'beep' );
// returns true

bool = isMethod( value, 'toString' );
// returns false

Notes

Value arguments other than null or undefined are coerced to objects.
```
var bool = isMethod( 'beep', 'toString' );
// returns false
```

Property arguments are coerced to strings.

function noop() {
    // Example function...
}

var value = {
    'null': noop
};
var bool = isMethod( value, null );
// returns true

value = {
    '[object Object]': noop
};
bool = isMethod( value, {} );
// returns true

The function searches only own properties.

Examples

var isMethod = require( '@stdlib/assert-is-method' );

var bool = isMethod( { 'a': isMethod }, 'a' );
// returns true

bool = isMethod( { 'a': 'b' }, 'a' );
// returns false

bool = isMethod( { 'a': 'b' }, null );
// returns false

bool = isMethod( {}, 'toString' );
// returns false

bool = isMethod( null, 'a' );
// returns false

bool = isMethod( void 0, 'a' );
// returns false

bool = isMethod( { 'null': isMethod }, null );
// returns true

bool = isMethod( { '[object Object]': isMethod }, {} );
// returns true

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.