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JavaScript JavaScript Loops, Arrays and Objects Simplify Repetitive Tasks with Loops Create a for Loop

Oscar Kam
Oscar Kam
4,281 Points
Posted by Oscar Kam
Oscar Kam
4,281 Points

Stuck on code challenge: For loops

So I'm stuck on the for loops code challenge. This is my code so far

var number = " ";

for ( var i = 4; i <= 156; i ++ 1 ) { number += i; }

console.log(number);

Its telling me I have a parse error. I have a feeling I did a really small, stupid thing.

Thanks in advance.

script.js 
var number = " ";

for ( var i = 4; i <= 156; i ++ 1 ) {
  number += i;
}

console.log(number);
Jesus Marco del Carmen
Jesus Marco del Carmen
10,393 Points
Jesus Marco del Carmen
Jesus Marco del Carmen
10,393 Points

for (var i = 4; i <= 156; i+=1) { console.log(i); }

Here you go. You don't necessarily need to create the var number=""; Every time the condition (4 <= i <= 156) it will log that number into the console.

Hope this helped.

1 Answer

Robert Stefanic
Robert Stefanic
35,170 Points
Robert Stefanic
Robert Stefanic
35,170 Points

It's having trouble because the variable you globally defined is a string because you put it in quotes, like this:

var number = " ";

It can't add an integer to a string. It's like trying to add "mark" to 5.

So just initially define your variable as either:

var number;

or

var number = 0;

Then it'll be able to add the value of i in your loop to the number variable, because it'll know that it's an integer.