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Reverse looping a triangle problem deleting string character

for (let i = "#"; i.length < 10; i+="#"){
  console.log(i);
 
}
for (let y = "*********"; y.length >0; y-="*"){
    console.log(y);
}

The first part is Eloquent JavaScript exercise. I wanted to make another loop starts from end of the first loop. The first loops ends with "########" and my other loop will start same amount of "#" but with "" and it should decrease until it has one "". So it would be reverse triangle like this:

#
##
**
*

I wanted to make it as simple as first loop. My question is can we make it like the first loop? And why "-=" is not working?

about 4 years ago · Juan Pablo Isaza

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Accepted Answer · 2022-07-04T07:23:47.697Z

You can not modify a string using -= operator. Use y = y.slice(0, -1) instead:

for (let i = "#"; i.length < 10; i += "#") {
  console.log(i);

}
for (let y = "*********"; y.length > 0; y = y.slice(0, -1)) {
  console.log(y);
}

More info here!

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Reverse looping a triangle problem deleting string character

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Andres GPT