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# typecheck-function - use `angular.isFunction` instead of `typeof` comparisons

You should use the angular.isFunction method instead of the default JavaScript implementation (typeof function(){} ==="[object Function]").

**Rule based on Angular 1.x**

## Examples

The following patterns are considered problems;

    /*eslint angular/typecheck-function: 2*/

    // invalid
    typeof someFunction === 'function' // error: You should use the angular.isFunction method

The following patterns are **not** considered problems;

    /*eslint angular/typecheck-function: 2*/

    // valid
    angular.isFunction(someFunction);

## Version

This rule was introduced in eslint-plugin-angular 0.1.0

## Links

* [Rule source](/rules/typecheck-function.js)
* [Example source](/examples/typecheck-function.js)