rc-js-util
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A collection of TS and C++ utilities to help writing performant and correct applications, achieved through strict typing and (removable) invariant checking.
21 lines • 510 B
JavaScript
/**
* @public
* Populates a `Map` given a key creating function and `ArrayLike`.
*
* @remarks
* keys which are null are omitted.
*
* See {@link arrayIndex}.
*/
export function arrayIndex(items, getKey) {
const indexed = new Map();
for (let i = 0, iEnd = items.length; i < iEnd; ++i) {
const item = items[i];
const key = getKey(item, i);
if (key !== null) {
indexed.set(key, item);
}
}
return indexed;
}
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