code: function each(callback) {
    // Don't bother continuing without a callback
    if (!callback) return this;
    // Iterate over the current collection
    for (let i = 0; i < this.length; i += 1) {
      // If the callback returns false
      if (callback.call(this[i], i, this[i]) === false) {
        // End the loop early
        return this;
      }
    }
    // Return `this` to allow chained DOM operations
    return this;
  }
docs: Iterate over the collection passing elements to `callback`