使用FOR循环在每次循环迭代中添加其他字符或符号

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.

Answer 1

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);
}

Answer 2

Simple loop for text appending:

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