@lodestar/beacon-node/lib/util/forkName.js

A Typescript implementation of the beacon chain

/**
 * Group an array of items by ForkName according to the slot associted to each item
 */
export function groupByFork(config, items, getSlot) {
    const itemsByFork = new Map();
    for (const item of items) {
        const forkName = config.getForkName(getSlot(item));
        let itemsInFork = itemsByFork.get(forkName);
        if (!itemsInFork) {
            itemsInFork = [];
            itemsByFork.set(forkName, itemsInFork);
        }
        itemsInFork.push(item);
    }
    return itemsByFork;
}
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