How to make a triangle using for loop javascript

Question

I have a simple question although i cannot manage to resolve this problem. Hope you can help. I need to make triangle using for loop and from this 4 exercises I don't know what to do with the third one. I haven't used Javascript before, so any help would be appreciated.

 # # # # #
   # # # #
     # # #     <----- here is triangle i need to make. Just in case 
       # #
         #

var i;
var j;
for (i = 0; i <= 5; i++ )
{
document.write("</br>");
for ( j = 0; j < 6-i; j++ )
{
document.write( "&nbsp&nbsp" );
}
for ( j = 6-i; j <= 5; j++ )
{

document.write( "*" );
}
}

This is code I wrote for D in photo. And I'm sorry i did not add it at first.

You need to add what you've tried so far

Vasan
– Vasan

2016-10-27 20:10:44 +00:00
Commented Oct 27, 2016 at 20:10 — Vasan
– Vasan, Commented Oct 27, 2016 at 20:10
Check out the how to ask...

Keno
– Keno

2016-10-27 20:12:14 +00:00
Commented Oct 27, 2016 at 20:12 — Keno
– Keno, Commented Oct 27, 2016 at 20:12

DaFois · Accepted Answer · 2018-05-14 16:50:47Z

4

for (let line = "*"; line.length < 8; line += "*")
  console.log(line);

this question came in this book: http://eloquentjavascript.net

I don't know why there are so bad answers on google for this one.

edited May 14, 2018 at 16:50

DaFois

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answered May 14, 2018 at 16:06

J M

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Comments

captainozlem · Accepted Answer · 2019-03-14 17:01:48Z

2

function leftTriangle(rows){
  let result = '';
  for(let i=rows;i>0;i--){
    if(i===rows) {
      result += '*'.repeat(i) + '\n';
    }else{
      let empty = rows-i
      result+= ' '.repeat(empty) + '*'.repeat(i)+ '\n'
    }
  }
  return result;
}

console.log(leftTriangle(5))

answered Mar 14, 2019 at 17:01

captainozlem

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Comments

Vasan · Accepted Answer · 2016-10-27 22:08:50Z

0

I'm sure there are better solutions (simply left-padding with spaces comes to mind), but here's the quick and dirty one I created from your own solution.

  for (var i = 0; i < 5; i++) {
    for (var j = 0; j < i; j++) {
      document.write("&nbsp;&nbsp;&nbsp;");
    }
    for (var j = 5; j > i; j--) {
      document.write("#");
      if (j > i + 1) document.write("&nbsp;");
    }
    document.write('<br/>')
  }

https://js.do/code/diamondsinthesky

answered Oct 27, 2016 at 22:08

Vasan

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1 Comment

Gevorg Sahabalyan Over a year ago

YES))) I think your solution is much better then mine. Thank you very very much.

user1289451 · Accepted Answer · 2016-10-27 20:33:27Z

0

Something like this?

var rows = 5;
for (var i = rows; i--;) {
  var columns = 0;
  while (columns <= i) {
    document.write('#');
    columns++
  }
  document.write('<br />\n');
}

answered Oct 27, 2016 at 20:33

user1289451

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1 Comment

Gevorg Sahabalyan Over a year ago

Thank you for your response. Unfortunately it didn't help because it gives triangle which i already made. Triangle B from the photo above.

Gevorg Sahabalyan · Accepted Answer · 2016-10-27 22:09:48Z

0

Thank you for your help. I did it. It was too obvious but somehow I couldn't find it. Thank you one more time. Here is how i did it.

 for (i = 5; i > 0; i--) {
         document.write("</br>");
        for (j = 0; j < 6 - i; j++) {
            document.write("&nbsp&nbsp");
        }
        for (j = 6 - i; j <= 5; j++) {

            document.write("*");
        }
    }

answered Oct 27, 2016 at 22:09

Gevorg Sahabalyan

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Comments

Gouri Das · Accepted Answer · 2020-07-18 04:12:25Z

0

var rows = 5;
for (var i = rows; i--;) {
  var columns = 0;
  while (columns <= i) {
    document.write('#');
    columns++
  }
  document.write('<br />\n');
}

answered Jul 18, 2020 at 4:12

Gouri Das

12 bronze badges

1 Comment

tshimkus Over a year ago

That generates triangle (A) from the question, but not triangle (C), which is specifically the one the OP is asking for help

Anita Matthew · Accepted Answer · 2022-01-07 19:19:22Z

0

You can also do this if you are looking for something different. This code is for a triangle of 7 lines.

let size = 8;
let y = "#";
for (let x = 0; x < size; x++)
{
  console.log(y);
  y += "#";
}

// Second method

for (let i = 1; i < size;i++)
{
  let me ="#".repeat(`${i}`)
  console.log(me);
  
}

edited Jan 7, 2022 at 19:19

answered Jan 7, 2022 at 17:16

Anita Matthew

12 bronze badges

2 Comments

Ken Richards Over a year ago

It appears you didn't address the question... poster asked how to produce the third result, not the first or second.

Andrzej Sydor Over a year ago

If you have a new question, please ask it by clicking the Ask Question button. Include a link to this question if it helps provide context. - From Review

DEVA .N · Accepted Answer · 2022-07-21 09:18:47Z

0

  var size = 5;
    for (var i = 0; i < size; i++) {
       for (var j = 0; j <= i; j++) {
            document.write("*");
          }
          document.write("<br />\n");
        }

edited Jul 21, 2022 at 9:18

answered Jul 21, 2022 at 1:10

DEVA .N

12 bronze badges

1 Comment

Saeed Zhiany Over a year ago

Please read How do I write a good answer?. While this code block may answer the OP's question, this answer would be much more useful if you explain how this code is different from the code in the question, what you've changed, why you've changed it and why that solves the problem without introducing others. - From Review

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