Arrow function is a very interesting concept in JavaScript. It makes our functions precise, meaningful and easy to read. Let’s code this. This is a function which is showing a string inside it.Â
function myFunction(){
console.log('I am a function')
}
myFunction()
We can convert this function into arrow notation very easily.Â
const myFunction = () => {
console.log('I am a function')
}
myFunction()
Here we are declaring a variable and assigning a function to it. Then we are calling this function, simple. We can even write this and it will work.Â
const myFunction = () => console.log('I am a function')
myFunction()
Now let’s pass one variable to the function.Â
function addFive(num){
return num+5
}
console.log(addFive(1))
We can convert this function into arrow notation in 3 ways.Â
const addFive = (num) => {return num+5}
const addFive = (num) => ( num+5)
const addFive = num => num+5
All three notations are fine but I recommend using the last one. Now let’s pass 2 variables in the function.Â
function add(num1, num2){
return num1+num2
}
Now we can reduce this function to arrow notation in 3 ways.Â
const add = (num1, num2) => {
return num1+num2
}
const add = (num1, num2) => (num1+num2)
const add = (num1, num2) => num1+num2
We can add 3, 4 or as many variables as we want in this. If there is one line in the function then we can skip any kinds of braces.
const add = (num1, num2) => num1+num2
If there is one expression in the function then we only need one set of braces.Â
const add = (num1, num2) => (`num 1: ${num1} and num2: ${num2}`)
Now we can also return an Object in our arrow function.Â
let name = 'Harper'
let age = 29
let weight = 65
const intro = (name, age, weight) => ({name, age, weight})
console.log(intro(name, age, weight))
I hope we have covered every possibility of the arrow function. Please remember that arrow notation is not valid when we use call()
, apply()
and bind()
methods.Â
If you have any questions please write that down in the comments section. We really appreciate that.