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for (let i = 0; i < 5; i++) {
    console.log(`Inside the loop: ${i}`);
}

console.log(`Outside the loop: ${i}`);

output:

Inside the loop: 0
Inside the loop: 1
Inside the loop: 2
Inside the loop: 3
Inside the loop: 4

and will be error:

Uncaught ReferenceError: i is not defined

because t the variable 'i' only exists and can be accessible inside the for loop block.

by Luka Tatarishvili

JavaScript

variables

Pro tip: use ```triple backticks around text``` to write in code fences