How to display pyramid using JavaScript?

Question

Here is the code to display pyramid but its not exactly producing required output.

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Answer 1

function generatePyramid(num) {
  for (var i = 1; i <= num; i++) {
    var arr = [];
    for (var j = 1; j <= i; j++) {
      arr.push(j);
    }
    console.log(arr);
  }
}

Answer 2

function pyramid() {
    var n = 5;
    var output="";
    for (var i = 0; i <n; i++) {
    var myspace = "";   
    for(let s = 0; s <(n-i-1); s++) {
        myspace += " ";
    }
        for (var j = 1; j <= 2*i + 1; j++) {
            output+="*";

        }
        console.log(myspace+output);
        output="";
    }
}

Output

            *
VM74:11    ***
VM74:11   *****
VM74:11  *******
VM74:11 ********* 

Answer 3

Shorter way

 function generatePyramid(n) {
        var output="";
        for (var i = 1; i <= n; i++) {
            output += i + " ";
            console.log(output);
        }
    }  

    generatePyramid(5);

Answer 4

So many inspiring answers; I like to add mine :)

    let m, o, r, c, pr = (n, x = (n << 1) - 1) => {
        m = (x >> 1) << 0;
        o = '';
        for (r = 0; r < n; r++) {
            for (c = 0; c < x; c++)
                o += (m - r <= c && m + r >= c) ? "#" : " ";
            o += '\n';
        }
        console.log(o);
    }

    pr(5);
    pr(20);
    pr(2);

Answer 5

A fun little solution :)

//set the value of n here      
var n = 5;
generateNumberTriangle(n);

function generateNumberTriangle(n) {
    var width = (2 * n) -1; // Always the case.
    var midpoint = Math.floor(width / 2); // Middle of pyramid.
    let level = ''; // will be reset each level loop

    for(var i = 0; i < n; i++) { // Looping through levels
        level = '';
        for(var j = 0; j < width; j++) {
            if(j < midpoint-i || j > midpoint+i) {
                level += '.';
            } else {
                level += '#';
            }
        }
        console.log(level);
    }
}

Answer 6

Here's a simple solution using ES6 syntax

function generatePyramid(num) {
  let number = '';

  for (let i = 1; i <= num; i++) {
    console.log(number += i);
  }
}
generatePyramid(5);