JavaScript Duck Model

Javascript: A background of inference from "duck type"

Learning Dynamic language all know a word: "If it walks like a duck, and it is called a duck, then it is Duck", JavaScript also supports duck type, the following is about duck type in JavaScript two scenarios.

Two inferences

1. Any such signature method: Object.Method (Arg1, arg2, ...) method, can be used method.apply (object, [Arg1, Arg2, ...]) Conduct research.
2. Some methods of array (do not modify the array state) can use arguments with Array.prototype.method.apply (ARGUMENTS,[ARG1, arg2, ...]) Called by the method.

1. The former: treat array as arguments (duck)
2. The latter: treat argument as an array (duck)

A small test

The idiomatic approach in JavaScript

1 Console.log (Math.max.apply (Math, [3,2,1]));23var arr = [1,2, 3] 4 Array.prototype.push.apply (arr, [4, 5, 6 Console.log (arr);  6 Span style= "color: #008080;" > 7  8 var Arr = Array.prototype.slice.apply (arguments);  9  Console.log (arr); 10}) (1, 3);     

We'll imitate the ducks ourselves.

1     3 });  2 Console.log (arr);  

Note

Duck type and implicit interface are a little bit similar, it expands the concept of polymorphism.

Original: http://www.cnblogs.com/happyframework/p/3239790.html

JavaScript Duck Model