Different ways of checking whether all items in an array are equal

everyItemEqual.js

const eq = (a) => (b) => a === b;

const everyItemEquala = compose(
    apply(all),
    juxt([compose(equals, head), identity])
);

const everyItemEqualb = compose(
    equals(1),
    length,
    uniq
);

const everyItemEqualc = (list) => new Set(list).size === 1;

const everyItemEquald = compose(
    equals(1),
    prop('size'),
    constructN(1, Set)
);

const everyItemEquale = (list) => list.every(eq(list[0]));

const everyItemEqualf = (list) => {
  var listLen = list.length - 1;
  for (var i = listLen; i >= 0; i--) {
    if (list[i] !== list[0]) return false;
  }
  return true;
};

// benchmarking https://jsbench.me/0ql6fdslkv/1