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authorMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
committerMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
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+// @flow strict
+import { SYMBOL_ITERATOR } from './symbols';
+
+declare function arrayFrom<T>(arrayLike: Iterable<T>): Array<T>;
+// eslint-disable-next-line no-redeclare
+declare function arrayFrom<T: mixed>(
+ arrayLike: mixed,
+ mapFn?: (elem: mixed, index: number) => T,
+ thisArg?: mixed,
+): Array<T>;
+
+/* eslint-disable no-redeclare */
+// $FlowFixMe[name-already-bound]
+const arrayFrom =
+ Array.from ||
+ function (obj, mapFn, thisArg) {
+ if (obj == null) {
+ throw new TypeError(
+ 'Array.from requires an array-like object - not null or undefined',
+ );
+ }
+
+ // Is Iterable?
+ const iteratorMethod = obj[SYMBOL_ITERATOR];
+ if (typeof iteratorMethod === 'function') {
+ const iterator = iteratorMethod.call(obj);
+ const result = [];
+ let step;
+
+ for (let i = 0; !(step = iterator.next()).done; ++i) {
+ result.push(mapFn.call(thisArg, step.value, i));
+ // Infinite Iterators could cause forEach to run forever.
+ // After a very large number of iterations, produce an error.
+ // istanbul ignore if (Too big to actually test)
+ if (i > 9999999) {
+ throw new TypeError('Near-infinite iteration.');
+ }
+ }
+ return result;
+ }
+
+ // Is Array like?
+ const length = obj.length;
+ if (typeof length === 'number' && length >= 0 && length % 1 === 0) {
+ const result = [];
+
+ for (let i = 0; i < length; ++i) {
+ if (Object.prototype.hasOwnProperty.call(obj, i)) {
+ result.push(mapFn.call(thisArg, obj[i], i));
+ }
+ }
+ return result;
+ }
+
+ return [];
+ };
+
+export default arrayFrom;