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JavaScript JavaScript Loops, Arrays and Objects Simplify Repetitive Tasks with Loops What are Loops?

Aviral Gupta
Aviral Gupta
5,586 Points
Posted by Aviral Gupta
Aviral Gupta
5,586 Points

We are declaring the randomNum variable again and again in loop? Is it ok?

Pls help me out!

function randomNumber(upper) { return Math.floor( Math.random() * upper ) + 1; }

var counter = 0; while( counter<10 ) { var randNum = randomNumber(6); // Why is this variable being declared again and again in loop in video?? document.write(randNum + ' '); counter += 1; }

2 Answers

Erik McClintock
Erik McClintock
45,783 Points
Erik McClintock
Erik McClintock
45,783 Points

Aviral,

In this instance, it doesn't really matter where the variable is declared, as JavaScript does not have what's known as "block scope". My guess is that Dave declared this variable inside his while loop because that's the only place he needs it, so it could just be as a reminder/good practice (since JavaScript DOES have function scope, so perhaps it's just a way to remember to declare things where they're needed to make your code efficient and safe). It is okay for the variable to be redeclared like this, though I don't believe that there is any particular technical need for it one way or the other.

Erik

Erik McClintock
Erik McClintock
45,783 Points
Erik McClintock
Erik McClintock
45,783 Points

Aviral,

Can you post the code that you're having difficulty with?

Erik