Pattern Printing Problems in JavaScript: 6 Star & Number Patterns Explained

Pattern 1: N×N star square

Given an integer N, print the following pattern.

N = 5
* * * * *
* * * * *
* * * * *
* * * * *
* * * * *

N = 3
* * *
* * *
* * *

function pattern(n) {
  for (let i = 0; i < n; i++) {
    let str = "";
    for (let j = 0; j < n; j++) {
      str += "* ";
    }
    console.log(str);
  }
}

let n = 5;
pattern(n);

Pattern 2: increasing star triangle

Given an integer N, print the following pattern.

*
* *
* * *
* * * *
* * * * *

function pattern(n) {
  for (let i = 1; i <= n; i++) {
    let stars = "";
    for (let j = 1; j <= i; j++) {
      stars += "* ";
    }
    console.log(stars);
  }
}

let n = 5;
pattern(n);

Pattern 3: increasing number triangle

Given an integer N, print the following pattern.

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

function pattern(n) {
  for (let i = 1; i <= n; i++) {
    let number = "";
    for (let j = 1; j <= i; j++) {
      number += j + " ";
    }
    console.log(number);
  }
}

let n = 5;
pattern(n);

Pattern 4: repeated-digit triangle

Given an integer N, print the following pattern.

1
2 2
3 3 3
4 4 4 4
5 5 5 5 5

function pattern(n) {
  for (let i = 1; i <= n; i++) {
    let numberPattern = "";
    for (let j = 1; j <= i; j++) {
      numberPattern += i + " ";
    }
    console.log(numberPattern);
  }
}

let n = 5;
pattern(n);

Pattern 5: decreasing star triangle

Given an integer N, print the following pattern.

* * * * *
* * * * 
* * * 
* *
*

function pattern(n) {
  for (let i = n; i >= 1; i--) {
    let stars = "";
    for (let j = 1; j <= i; j++) {
      stars += "* ";
    }
    console.log(stars);
  }
}

let n = 5;
pattern(n);

Pattern 6: decreasing number triangle

Given an integer N, print the following pattern.

1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

function pattern(n) {
  for (let i = n; i >= 1; i--) {
    let numbers = "";
    for (let j = 1; j <= i; j++) {
      numbers += j + " ";
    }
    console.log(numbers);
  }
}

let n = 5;
pattern(n);