define

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2023-12-01

Create a new constructor function for a type inheriting from ArrayLikeSequence.

Signature

ArrayLikeSequence.define = function(methodName, overrides) { /*...*/ }

ArrayLikeSequence.define = function define(methodName, overrides) {
  if (!overrides || typeof overrides.get !== 'function') {
throw new Error("A custom array-like sequence must implement *at least* get!");
  }

  return defineSequenceType(ArrayLikeSequence, methodName, overrides);
}

Name	Type(s)	Description
methodName	string\|Array.<string>	The name(s) of the method(s) to be used for constructing the new sequence. The method will be attached to the `ArrayLikeSequence` prototype so that it can be chained with any other methods that return array-like sequences.
overrides	Object	An object containing function overrides for this new sequence type. Must include `get`. May include `init`, `length`, `getIterator`, and `each`. For each function, `this` will be the new sequence and `this.parent` will be the source sequence.
returns	Function	A constructor for a new type inheriting from `ArrayLikeSequence`.

Examples

Lazy.ArrayLikeSequence.define("offset", {
  init: function(offset) {
this.offset = offset;
  },

  get: function(i) {
return this.parent.get((i + this.offset) % this.parent.length());
  }
});

Lazy([1, 2, 3]).offset(1) // sequence: [2, 3, 1]