Can I declare the same variable twice in different for loops in JavaScript? [duplicate]

Answer 1

No you shouldn't. Variables declared using var have function scope, not block scope!

Redeclaring a variable using var might suggest that the variable is local to the loop/block when it isn't.

You could, however use let to declare the variable, to ensure it is block-scoped.

for (let x = 1; x <= 3; x++) {
   console.log(x)
}
    
for (let w = 65, x = String.fromCharCode(w); w <= 67; w++, x = String.fromCharCode(w)){
    console.log(x)
}

console.log(typeof x) // undefined