Use FOR loop to add additional characters or symbols each loop iteration

Question

Using a FOR loop to add and output numbers is easy. But how do you add and output additional characters?

For example the following simple program outputs the numbers 1 through 7 to the console.

for (var count = 0; count < 7; count++) {
    console.log(count + 1);
}

But what if instead of numbers I needed to add additional characters or symbols each loop? For example how would someone output characters to the console like this?

A

AA

AAA

AAAA

AAAAA

AAAAAA

AAAAAAA

I'm sure the answer is straightforward but I don't know how to approach this type of problem.

Have another for loop inside that loops from 1 to count, and output a character at each iteration. After the inner for loop emit the line break — Dijkgraaf
– Dijkgraaf, Commented Jun 22, 2017 at 18:56
var txt = ""; for(var count = 0; count < 7; count++) { console.log(txt+="A"); } — mjw
– mjw, Commented Jun 22, 2017 at 18:58
Also, see these questions and answers about writing a pad function stackoverflow.com/questions/2686855/… — Dijkgraaf
– Dijkgraaf, Commented Jun 22, 2017 at 19:00

Daniel Mizerski · Accepted Answer · 2017-06-22 19:15:30Z

4

It is rather easy.

for (var count = 0; count < 7; count++) {
    switch (count) {
        case 7: console.log('AAAAAAA'); break;
        case 6: console.log('AAAAAA'); break;
        case 5: console.log('AAAAA'); break;
        case 4: console.log('AAAA'); break;
        case 3: console.log('AAA'); break;
        case 2: console.log('AA'); break;
        case 1: console.log('A'); break;
        case 0: console.log('xd'); break;
    }
}

Okay... jokes aside.

But for real:

for (var count = 0; count < 7; count++) {
    console.log(new Array(count + 1).join('A'));
}

Or if you badly want to append:

for (var str = ""; str.length < 10; str += "A") {
    console.log(str);
}

edited Jun 22, 2017 at 19:15

answered Jun 22, 2017 at 18:58

Daniel Mizerski

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10 Comments

Dijkgraaf Over a year ago

That would work, but rather unwieldy and doesn't scale well. e.g. if you had to do that 1000s of times

Daniel Mizerski Over a year ago

I gave better answer :)

vbguyny Over a year ago

Danny, you code only works for count = 1 through 7. What if I want 8 or more? ;-P

Daniel Mizerski Over a year ago

@vbguyny copypaste more!!

mjw Over a year ago

people have no shame

|

mjw · Accepted Answer · 2017-06-22 19:05:14Z

3

Simple loop for text appending:

var txt = ""; 
for(var count = 0; count < 7; count++) { 
    console.log(txt+="A"); 
}

answered Jun 22, 2017 at 19:05

mjw

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