rc-js-util/bin/cjs/array/impl/array-index.js

A collection of TS and C++ utilities to help writing performant and correct applications, achieved through strict typing and (removable) invariant checking.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.arrayIndex = void 0;
/**
 * @public
 * Populates a `Map` given a key creating function and `ArrayLike`.
 *
 * @remarks
 * keys which are null are omitted.
 *
 * See {@link arrayIndex}.
 */
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;
}
exports.arrayIndex = arrayIndex;
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