If you write a variable and assigned it before declare, like below example
a = 10 console.log(a+20) var a
It will work perfectly.
Here, I have assigned a variable by value 10, and I also used this variable in console.log() , and it has given output 30.
This behavior is called “hoisting“. Where a variable can appear to be used before it’s declared.
let a a = 10 console.log(a+20)