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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"?