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authorRaindropsSys <contact@minteck.org>2023-06-22 23:06:12 +0200
committerRaindropsSys <contact@minteck.org>2023-06-22 23:06:12 +0200
commit23563c7188e089929b60f9e10721c6fc43a220ff (patch)
treeedfe2b009c82900d4ac27db02222d2f68dcad846 /includes/external/school/node_modules/graphql/jsutils/safeArrayFrom.js.flow
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-// @flow strict
-import { SYMBOL_ITERATOR } from '../polyfills/symbols';
-
-/**
- * Safer version of `Array.from` that return `null` if value isn't convertible to array.
- * Also protects against Array-like objects without items.
- *
- * @example
- *
- * safeArrayFrom([ 1, 2, 3 ]) // [1, 2, 3]
- * safeArrayFrom('ABC') // null
- * safeArrayFrom({ length: 1 }) // null
- * safeArrayFrom({ length: 1, 0: 'Alpha' }) // ['Alpha']
- * safeArrayFrom({ key: 'value' }) // null
- * safeArrayFrom(new Map()) // []
- *
- */
-export default function safeArrayFrom<T>(
- collection: mixed,
- mapFn: (elem: mixed, index: number) => T = (item) => ((item: any): T),
-): Array<T> | null {
- if (collection == null || typeof collection !== 'object') {
- return null;
- }
-
- if (Array.isArray(collection)) {
- return collection.map(mapFn);
- }
-
- // Is Iterable?
- const iteratorMethod = collection[SYMBOL_ITERATOR];
- if (typeof iteratorMethod === 'function') {
- // $FlowFixMe[incompatible-use]
- const iterator = iteratorMethod.call(collection);
- const result = [];
- let step;
-
- for (let i = 0; !(step = iterator.next()).done; ++i) {
- result.push(mapFn(step.value, i));
- }
- return result;
- }
-
- // Is Array like?
- const length = collection.length;
- if (typeof length === 'number' && length >= 0 && length % 1 === 0) {
- const result = [];
- for (let i = 0; i < length; ++i) {
- if (!Object.prototype.hasOwnProperty.call(collection, i)) {
- return null;
- }
- result.push(mapFn(collection[String(i)], i));
- }
-
- return result;
- }
-
- return null;
-}