mirror of
https://github.com/swc-project/swc.git
synced 2024-12-23 05:32:09 +03:00
41 lines
1.2 KiB
TypeScript
41 lines
1.2 KiB
TypeScript
|
// Loaded from https://deno.land/x/graphql_deno@v15.0.0/lib/jsutils/isCollection.js
|
||
|
|
||
|
|
||
|
import { SYMBOL_ITERATOR } from '../polyfills/symbols.js';
|
||
|
/**
|
||
|
* Returns true if the provided object is an Object (i.e. not a string literal)
|
||
|
* and is either Iterable or Array-like.
|
||
|
*
|
||
|
* This may be used in place of [Array.isArray()][isArray] to determine if an
|
||
|
* object should be iterated-over. It always excludes string literals and
|
||
|
* includes Arrays (regardless of if it is Iterable). It also includes other
|
||
|
* Array-like objects such as NodeList, TypedArray, and Buffer.
|
||
|
*
|
||
|
* @example
|
||
|
*
|
||
|
* isCollection([ 1, 2, 3 ]) // true
|
||
|
* isCollection('ABC') // false
|
||
|
* isCollection({ length: 1, 0: 'Alpha' }) // true
|
||
|
* isCollection({ key: 'value' }) // false
|
||
|
* isCollection(new Map()) // true
|
||
|
*
|
||
|
* @param obj
|
||
|
* An Object value which might implement the Iterable or Array-like protocols.
|
||
|
* @return {boolean} true if Iterable or Array-like Object.
|
||
|
*/
|
||
|
|
||
|
export default function isCollection(obj) {
|
||
|
if (obj == null || typeof obj !== 'object') {
|
||
|
return false;
|
||
|
} // Is Array like?
|
||
|
|
||
|
|
||
|
const length = obj.length;
|
||
|
|
||
|
if (typeof length === 'number' && length >= 0 && length % 1 === 0) {
|
||
|
return true;
|
||
|
} // Is Iterable?
|
||
|
|
||
|
|
||
|
return typeof obj[SYMBOL_ITERATOR] === 'function';
|
||
|
}
|