@pabra/sortby/dist/esm/index.js

Provide typesafe function to be passed to Array.prototype.sort() to sort an Array of Objects by multiple keys.

function isLower(left, right) {
    return left < right;
}
function isGreater(left, right) {
    return left > right;
}
function compareAsc(left, right) {
    return isLower(left, right) ? -1 :
        isGreater(left, right) ? 1 :
            0;
}
function compareDesc(left, right) {
    return isLower(left, right) ? 1 :
        isGreater(left, right) ? -1 :
            0;
}
export function by(...keys) {
    const chain = keys.map(entry => {
        const [keyOrExtractor, direction] = Array.isArray(entry)
            ? entry
            : [entry, 'asc'];
        const extractor = typeof keyOrExtractor === 'function'
            ? keyOrExtractor
            : (thing) => thing[keyOrExtractor];
        return [extractor, direction === 'asc' ? compareAsc : compareDesc];
    });
    return (left, right) => {
        for (let i = 0, l = chain.length; i < l; i++) {
            const [extractor, cmp] = chain[i];
            const result = cmp(extractor(left), extractor(right));
            if (result !== 0) {
                return result;
            }
        }
        return 0;
    };
}
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