Question

An optimized version of Sequence#concat that returns another ArrayLikeSequence if the argument is an array.

Signature

ArrayLikeSequence.concat = function(var_args) { /*...*/ }

ArrayLikeSequence.concat = function concat(var_args) {
  if (arguments.length === 1 && isArray(arguments[0])) {
return new IndexedConcatenatedSequence(this, (/** @type {Array} */ var_args));
  } else {
return Sequence.prototype.concat.apply(this, arguments);
  }
}

Name	Type(s)	Description
var_args	...*

Examples

Lazy([1, 2]).concat([3, 4]) // instanceof Lazy.ArrayLikeSequence
Lazy([1, 2]).concat([3, 4]) // sequence: [1, 2, 3, 4]