@electric-sql/d2mini/dist/operators/keying.js

D2Mini is a minimal implementation of Differential Dataflow for performing in-memory incremental view maintenance.

import { map } from './map.js';
/**
 * Takes an unkeyed input and returns a keyed result
 * @param keyFn - Function to generate the key for each value
 */
export function keyBy(keyFn) {
    return map((value) => [keyFn(value), value]);
}
/**
 * Removes the key from a keyed stream
 */
export function unkey() {
    return map(([_, value]) => value);
}
/**
 * Takes a keyed input and rekeys it with a new key
 * @param keyFn - Function to generate the new key for each value
 */
export function rekey(keyFn) {
    return map(([_, value]) => [keyFn(value), value]);
}
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