Javascript

Question

I need help please, i started my javascript career with Eloquent Javascript and bumped into this problem.
I was asked in an exercise to write a loop that displays numbers from 1 - 100 in the console.
now, i was asked to replace that were divisible by 3 with "Fizz" and those divisible by 5 with "Buzz" So i wrote this code:

<script type="text/javascript">
for(var num=1; num <= 100; num++){

if (num % 3 ==0) {
console.log= "fizz";
}

if (num % 5 ==0) {
console.log= "buzz";
}
console.log(num);
}

and got it wrong.

Now this was the solution:

<script type="text/javascript">
for(var num=1; num <= 100; num++){
var output="";

if (num % 3 ==0) {
output += "fizz";
}

if (num % 5 ==0) {
output += "buzz";
}
console.log(output || num);
}

But a dont understand why they had to create a variable with an empty string and the rest of the flow with that output variable confuses me.

I need your help please.

Answer 1

Your task was to replace the numbers divisible by 3 or 5. You didn't replace the numbers, you just added "buzz" and "fizz" to these numbers.
The empty output string is required to test, if this variable is set. If it isn't, then the number is printed. -> console.log(output || num)

Answer 2

maybe this will be your solution:

for ( var i = 1; i <=100; i++){
if(i%3===0){
console.log ("fizz");
} else if (i%5===0){
console.log("buzz");
} else {
console.log(i);
}
}

Answer 3

Thank you so much

Answer 4

book " Secrets of the JavaScript ninja"

Answer 5

Please could you recommend an in-depth javascript program book or tutorial for me?