Pyramid Algorithm JS

Question

I was messing around with some basic algorithms. I wanted to know if someone has a shorter version of this one in JS to display the pyramid:

const total= 30;
let line = 1;

for (let i = 1; i < total; i = i + 2) {
    console.log(' '.repeat(total / 2 - line) + '*'.repeat(i))
    line++;
}

There isn't much you could do to optimize this, but you could remove either line or i, as both increase by a set amount each iteration. (Note that i = line * 2 - 1.) After that, there are some micro-optimizations, but usually the browser takes care of those. — CerebralFart
– CerebralFart, Commented Jun 18, 2020 at 13:43
There's a whole website for these kinds of questions - codegolf.stackexchange.com You might consider migrating it there for even more answers. — גלעד ברקן
– גלעד ברקן, Commented Jun 18, 2020 at 18:26

Mister Jojo · Accepted Answer · 2020-06-18 13:51:50Z

3

that ?

let s = '*'
for(let p=15;p--;) 
  {
  console.log( ' '.repeat(p) + s)
  s += '**'
  }

.as-console-wrapper { max-height: 100% !important; top: 0; }

answered Jun 18, 2020 at 13:51

Mister Jojo

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Girish Sasidharan · Accepted Answer · 2020-06-18 13:56:31Z

0

Same using map function

function pyramid(height) {
  return Array(height).fill('*')
    .map((current, index) =>
      ' '.repeat(height - index) +
      current.repeat(index).split('').join(' ') +
      ' '.repeat(height - index))
    .join('\n');
}
console.log(pyramid(30));

answered Jun 18, 2020 at 13:56

Girish Sasidharan

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Nina Scholz · Accepted Answer · 2020-06-18 14:12:44Z

0

An even shorter approach by using a while statement.

This answer is highly inspired by the answer of Mister Jojo.

let s = '*',
    p = 15;
    
while (p--) {
    console.log(' '.repeat(p) + s)
    s += '**';
}

.as-console-wrapper { max-height: 100% !important; top: 0; }

answered Jun 18, 2020 at 14:12

Nina Scholz

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trincot · Accepted Answer · 2020-06-18 15:27:42Z

0

console.log(Array.from({length:15},(_,i)=>"*".repeat(i*2+1).padStart(15+i)).join`\n`);

answered Jun 18, 2020 at 15:27

trincot

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