Function Expressions in JavaScript

In JavaScript, functions can also be defined using expressions, known as function expressions. These functions can be anonymous (unnamed) and are assigned to variables.

functionExpressions.js

let add = function(a, b){
	return a + b;
}

let a = 5;
let b = 3;
let sum = add(5, 3);

console.log(`Sum of ${a} and ${b} is ${sum}`);

 

Output

Sum of 5 and 3 is 8

What Does This Function Do?

1.   Stores the Function: The function is not named directly but is assigned to the variable add. This means you can call the function using the variable name add.

 

2.   Adds Two Numbers: When you call add, you pass two arguments to it, which correspond to the parameters a and b. The function will add these two numbers together and return the sum.

Previous                                                    Next                                                    Home