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Question

https://sololearn.com/coach/1239/?ref=app

var expression = readLine();

for (let i = 0;i<3;i++)
{
console .log(expression );
}

Answer 1

Khomi TAKAYANAGI

let is block scope means if you try to access i outside the loop it will give error but if you use var instead of let then you can access i outside the loop.

var expression = readLine();

for (let i = 0;i<3;i++)
{
console .log(expression );
}

console.log(i);//error: i is not defined

-------------

var expression = readLine();

for (var i = 0;i<3;i++)
{
console .log(expression );
}

console.log(i); //no error and print 3

Answer 2

Khomi TAKAYANAGI ,

your code should work fine, so what is your question?

Answer 3

Khomi TAKAYANAGI

Working fine what is issue here?

Answer 4

I don't understand enough how to use "let"

Answer 5

var expression = readLine()

for (var i = 0 ; i < 3 ; i ++){console.log(expression);}

it worked.

var expression = readLine()

for (var i = 0 ; i < 3 ; i ++){console.log(i);}

//no error but it outputs
0
1
2

¿How can I decide to use "var" or "let"?