time-to-botec/squiggle/node_modules/@stdlib/assert/is-method/README.md

141 lines
2.6 KiB
Markdown
Raw Normal View History

<!--
@license Apache-2.0
Copyright (c) 2018 The Stdlib Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
# isMethod
> Test if an object has a specified method name.
<section class="usage">
## Usage
```javascript
var isMethod = require( '@stdlib/assert/is-method' );
```
#### isMethod( value, property )
Returns a `boolean` indicating if a `value` has a specified [**own**][@stdlib/assert/has-own-property] method name.
```javascript
function noop() {
// Example function...
}
var value = {
'beep': noop
};
var bool = isMethod( value, 'beep' );
// returns true
bool = isMethod( value, 'toString' );
// returns false
```
</section>
<!-- /.usage -->
<section class="notes">
## Notes
- Value arguments other than `null` or `undefined` are coerced to `objects`.
```javascript
var bool = isMethod( 'beep', 'toString' );
// returns false
```
- Property arguments are coerced to `strings`.
```javascript
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**][@stdlib/assert/has-own-property] properties.
</section>
<!-- /.notes -->
<section class="examples">
## Examples
<!-- eslint-disable object-curly-newline -->
<!-- eslint no-undef: "error" -->
```javascript
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
```
</section>
<!-- /.examples -->
<section class="links">
[@stdlib/assert/has-own-property]: https://www.npmjs.com/package/@stdlib/assert/tree/main/has-own-property
</section>
<!-- /.links -->