@lodestar/beacon-node/lib/sync/range/utils/chainTarget.js

A Typescript implementation of the beacon chain

import { toRootHex } from "@lodestar/utils";
export function computeMostCommonTarget(targets) {
    if (targets.length === 0) {
        throw Error("Must provide at least one target");
    }
    const countById = new Map();
    let mostCommonTarget = targets[0];
    let mostCommonCount = 0;
    for (const target of targets) {
        const targetId = `${target.slot}-${toRootHex(target.root)}`;
        const count = 1 + (countById.get(targetId) ?? 0);
        countById.set(targetId, count);
        if (count > mostCommonCount) {
            mostCommonCount = count;
            mostCommonTarget = target;
        }
    }
    return mostCommonTarget;
}
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