Adding different number of '-' in every loop (javascript)

Question

I need to create a string like this: 01-2--3---4----5-----6------7------- for a let n=7, using a loop. I've created something like this so far:

let numbers = '';
n = 7;
for(i=0; i<=n; i++) {
numbers += i;
if (i>0) {
numbers += ('-')
}}

which gives me: "01-2-3-4-5-6-7-". Don't know how to change the code so that it could multiply the number of '-' equal n in every loop.

Answer 1

What you need is a nested loop, to iterate over the value of i in the outer loop.

const n = 7
let result=''
for (let i = 0; i <= n; i++) {
 let dashes=''
 for(let j=0; j < i; j++){
 dashes+='-'
 }
 result+= `${i}${dashes}`
}
console.log(result)

Answer 2

You could use String#repeat for the wanted dash.

Do not forget to declare any variable.

let numbers = '',
 n = 7;
for (let i = 0; i <= n; i++) numbers += i + '-'.repeat(i);
console.log(numbers);

Answer 3

This the solution for your problem:

var numbers = '';
var n = 7;
for(var i = 0; i <= n; i++) {
numbers += i;
 for(var j = 0; j < i; j++) {
 numbers += "-";
 }
}