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Contents
import { get } from './property_get';
/**
@module @ember/utils
*/
/**
Verifies that a value is `null` or `undefined`, an empty string, or an empty
array.
Constrains the rules on `isNone` by returning true for empty strings and
empty arrays.
If the value is an object with a `size` property of type number, it is used
to check emptiness.
```javascript
isEmpty(); // true
isEmpty(null); // true
isEmpty(undefined); // true
isEmpty(''); // true
isEmpty([]); // true
isEmpty({ size: 0}); // true
isEmpty({}); // false
isEmpty('Adam Hawkins'); // false
isEmpty([0,1,2]); // false
isEmpty('\n\t'); // false
isEmpty(' '); // false
isEmpty({ size: 1 }) // false
isEmpty({ size: () => 0 }) // false
```
@method isEmpty
@static
@for @ember/utils
@param {Object} obj Value to test
@return {Boolean}
@public
*/
export default function isEmpty(obj) {
let none = obj === null || obj === undefined;
if (none) {
return none;
}
if (typeof obj.size === 'number') {
return !obj.size;
}
let objectType = typeof obj;
if (objectType === 'object') {
let size = get(obj, 'size');
if (typeof size === 'number') {
return !size;
}
}
if (typeof obj.length === 'number' && objectType !== 'function') {
return !obj.length;
}
if (objectType === 'object') {
let length = get(obj, 'length');
if (typeof length === 'number') {
return !length;
}
}
return false;
}
Version data entries
3 entries across 3 versions & 1 rubygems