Arrow function expression |

A syntactically compact alternative to a regular function expression

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Arrow function expressions are ill suited as methods, and they cannot be used as constructors.

In the old days, we define a function like this:

function addNums(num1, num2) {
  console.log(num1 + num2);
}
// expected printout: NaN, means not a number, given that we didn't specify the values

Assign default values to parameters:

function addNums(num1 = 1, num2 = 1) {
  console.log(num1 + num2);
}
// expected printout: 2; the function takes in the default values

Call-back:

function addNums (num1 = 1, num2 = 1) {
    return num1 + num2;
}

console.log(addNums(5,5));
// expected printout: 10

const addNums = (num1 = 1, num2 = 1) => {
    return num1 + num2;
}
console.log(addNums(5,5));

It works, but you don’t necessarily have to include the curly braces. Make it simple like this:

const addNums = (num1 = 1, num2 = 1) => console.log(num1 + num2);

addNums(5,5)

If you want to return the result, you don’t even need the return keyword.

const addNums = (num1 = 1, num2 = 1) => num1 + num2;
console.log(addNums(5,5));