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30secondsofcode
2018-01-12 11:39:03 +00:00
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README.md
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@ -262,7 +262,6 @@ average(1, 2, 3);
* [`cleanObj`](#cleanobj)
* [`functions`](#functions)
* [`functionsIn`](#functionsin)
* [`invertKeyValues`](#invertkeyvalues)
* [`lowercaseKeys`](#lowercasekeys)
* [`mapKeys`](#mapkeys)
@ -3926,42 +3925,19 @@ cleanObj(testObj, ['a'], 'children'); // { a: 1, children : { a: 1}}
### functions
Returns an array of function property names from own enumerable properties of object.
Returns an array of function property names from own (and optionally inherited) enumerable properties of an object.
Use `Object.keys(obj)` to iterate over the object's own properties, `Array.filter()` to keep only those that are functions.
Use `Object.keys(obj)` to iterate over the object's own properties.
If `inherited` is `true`, use `Object.get.PrototypeOf(obj)` to also get the object's inherited properties.
Use `Array.filter()` to keep only those properties that are functions.
Omit the second argument, `inherited`, to not include inherited properties by default.
```js
const functions = obj => Object.keys(obj).filter(key => typeof obj[key] === 'function');
```
<details>
<summary>Examples</summary>
```js
function Foo() {
this.a = () => 1;
this.b = () => 2;
}
functions(new Foo()); // ['a', 'b']
```
</details>
<br>[⬆ Back to top](#table-of-contents)
### functionsIn
Returns an array of function property names from own and inherited enumerable properties of object.
Use `Object.keys(obj)` and `Object.get.PrototypeOf(obj)` to iterate over the object's own and inherited properties, `Array.filter()` to keep only those that are functions.
Use the spread operator (`...`) to combine all returned property names into one array.
```js
const functionsIn = obj =>
[...Object.keys(obj), ...Object.keys(Object.getPrototypeOf(obj))].filter(
key => typeof obj[key] === 'function'
);
const functions = (obj, inherited = false) =>
(inherited
? [...Object.keys(obj), ...Object.keys(Object.getPrototypeOf(obj))]
: Object.keys(obj)
).filter(key => typeof obj[key] === 'function');
```
<details>
@ -3973,7 +3949,8 @@ function Foo() {
this.b = () => 2;
}
Foo.prototype.c = () => 3;
functionsIn(new Foo()); // ['a', 'b', 'c']
functions(new Foo()); // ['a', 'b']
functions(new Foo(), true); // ['a', 'b', 'c']
```
</details>

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docs/index.html
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snippets/functions.md
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@ -9,7 +9,10 @@ Omit the second argument, `inherited`, to not include inherited properties by de
```js
const functions = (obj, inherited = false) =>
(inherited ? [...Object.keys(obj), ...Object.keys(Object.getPrototypeOf(obj))] : Object.keys(obj)).filter(key => typeof obj[key] === 'function');
(inherited
? [...Object.keys(obj), ...Object.keys(Object.getPrototypeOf(obj))]
: Object.keys(obj)
).filter(key => typeof obj[key] === 'function');
```
```js