JavaScript Function Expressions - 18

A function expression is another way of creating a function. It makes your code maintainable because each function has its task and it avoids scope pollution - a term used when variables are cluttered within the namespace, thereby making your program more prone to error.

In this tutorial we will focus on function expressions in the following sections:

  1. Basic syntaxes of the function expression
  2. Ways of creating a function pollution
    • Anonymous function
      • Function without function name
      • Self-invoked function
    • Arrow function
  3. Limitations of arrow functions
    • Keywords like this, super, arguments, new.target, and yield can’t be used.
    • Can’t be used as a constructor.
    • Can’t use the syntax of call, apply, and bind methods on arrow functions.

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JavaScript Function Expressions - 18