JavaScript Recipes: A Problem-Solution Article

JavaScript Recipes: A Problem-Solution Article

JavaScript Recipes: A Problem-Solution Article. Best practices you can follow, and everything JavaScript has to offer. Using a problem-solution approach. JavaScript has one thread. What is Javascript object creation best practice? This article provides a lot of recommendations with particular examples to solve the issues that users may face in Javascript.

Why reinvent the wheel every time you run into a problem with JS? This article is chock-full of code recipes that address common programming tasks.

Q: What is Javascript object creation best practice?

How to protect themselves from errors, if the new keyword is used? I always capitalize constructor names. I use this instanceof funcName to validate the instance, and avoid this instanceof arguments.callee due to performance reasons.

A:

It is definitely a good practice to create objects with help of the new keyword. It is common convention: constructor functions have names that start with capital letters. The fact that constructor invocation is different from regular function invocation is another reason we give constructors names start with capital letters. Constructors are created to be invoked as constructors, with the new keyword. Constructors will not work properly, if they are invoked as a regular functions.

var Obj = function () {
    "use strict";
    this.pew = 100;
};

// Correct
new Obj.pew++;

// A user will get an error
Obj(); // TypeError: this is undefined

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