Javascript: The good parts for humans (part 3)
Download as PPTX, PDF1 like441 views
This document discusses different patterns for invoking functions and setting the value of 'this' in JavaScript. It covers: the method invocation pattern where 'this' refers to the object containing the method; the function invocation pattern where 'this' defaults to the global object; the constructor invocation pattern where 'this' refers to a new object created; and the apply invocation pattern where 'this' is explicitly set as the first parameter of the apply method.
![Function invocation pattern
this - global object [design mistake]
inner functions this: refers to global object
var that = this
Sample 2](https://image.slidesharecdn.com/day3-140806225257-phpapp01/85/Javascript-The-good-parts-for-humans-part-3-4-320.jpg)
Javascript: The good parts for humans (part 3)
- 1. JavaScript The good parts for humans (part 3) B Anjaneyulu Reddy Email: anji.t6@gmail.com Twitter: @_anji www.evibe.in
- 2. Agenda Day 2 revisit this property arguments property
- 3. Method invocation pattern method: function stored as a property this - object containing method late binding Sample 1
- 4. Function invocation pattern this - global object [design mistake] inner functions this: refers to global object var that = this Sample 2
- 5. Constructor invocation pattern functions invoked with new prefix this - new object created no explicit return value - this is returned hidden link to function's prototype Sample 3
- 6. Apply invocation pattern apply method • two parameters o value for this o array of parameters this - first parameter of apply Sample 4
- 7. Questions?
- 8. Thank You