JavaScript Tutorial: Learn Functions and Arrow Functions with Examples

 

JS Function programs collection

JS program to show the concept of arrow function

1. JS program to print hi using arrow function

<script>

s=()=>//same as function s()

{

  console.log("hi");

}

s();

</script>

2. JS program to print sum of two numbers using arrow function

<script>

sum=()=>//same as function sum()

{

  var a=30,b=20;

  return a+b;

}

console.log(sum());

</script>

Or

traditional way to use function

<script>

function sum()

{

  var a=30,b=20;

  return a+b;

}

console.log(sum());

</script>

3.JS program to print sum of two numbers using arrow function and passing parameters.

<script>

sum=(a,b)=>//means the function sum is accepting two parameters

{

  return a+b;

}

console.log(sum(12,13));

</script>


Or

<script>

sum=(a,b)=> a+b;//means the function sum is accepting two parameters

console.log(sum(12,13));

</script>


Note:We can not use return with a+b e.g. return a+b. Js does not support.
Use under braces. This is called implicit return. It means returning value without using return.