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, Jun 22 '17 at 18:56
`var txt = ""; for(var count = 0; count < 7; count++) { console.log(txt+="A"); }` — mjw, Jun 22 '17 at 18:58
Also, see these questions and answers about writing a pad function https://stackoverflow.com/questions/2686855/is-there-a-javascript-function-that-can-pad-a-string-to-get-to-a-determined-leng — Dijkgraaf, Jun 22 '17 at 19:00

Daniel Mizerski · Answer 1 · 2017-06-22T19:15:30.667

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 '17 at 19:15

answered Jun 22 '17 at 18:58

Daniel Mizerski

1,123
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1

That would work, but rather unwieldy and doesn't scale well. e.g. if you had to do that 1000s of times – Dijkgraaf Jun 22 '17 at 18:59
2

I gave better answer :) – Daniel Mizerski Jun 22 '17 at 19:00
Danny, you code only works for count = 1 through 7. What if I want 8 or more? ;-P – vbguyny Jun 22 '17 at 19:04
1

@vbguyny copypaste more!! – Daniel Mizerski Jun 22 '17 at 19:05
people have no shame – mjw Jun 22 '17 at 19:07
It is called joke, I gave the most scalable answer :) – Daniel Mizerski Jun 22 '17 at 19:08
have some pts friend – mjw Jun 22 '17 at 19:09
[we hate fun](https://stackoverflow.blog/2010/01/04/stack-overflow-where-we-hate-fun/) – Petter Friberg Jun 22 '17 at 19:09
@PetterFriberg why? When I hit 12k rep I will hate fun too? – Daniel Mizerski Jun 22 '17 at 19:10
@PetterFriberg I will remember your name, and I will write when I pass that some day. – Daniel Mizerski Jun 22 '17 at 19:12

score 3 · Accepted Answer · answered Jun 22 '17 at 19:05

3

Simple loop for text appending:

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

answered Jun 22 '17 at 19:05

mjw

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

2 Answers2