Exploring Nested Loops in TypeScript

for (let i = 0; i < 3; i++) {
   for (let j = 0; j < 3; j++) {
       console.log(`i = ${i}, j = ${j}`); // e.g., "i = 0, j = 0"
    }
}
/*
Prints:
i = 0, j = 0
i = 0, j = 1
i = 0, j = 2
i = 1, j = 0
i = 1, j = 1
i = 1, j = 2
i = 2, j = 0
i = 2, j = 1
i = 2, j = 2
*/

let i = 0;
while (i < 3) {
    let j = 0;
    while (j < 3) {
        console.log(`i = ${i}, j = ${j}`); // e.g., "i = 0, j = 0"
        j++;
    }
    i++;
}
/*
Prints:
i = 0, j = 0
i = 0, j = 1
i = 0, j = 2
i = 1, j = 0
i = 1, j = 1
i = 1, j = 2
i = 2, j = 0
i = 2, j = 1
i = 2, j = 2
*/

let matrix: number[][] = [
    [1, 2, 3],
    [4, 5, 6], 
    [7, 8, 9]
];

for (let i = 0; i < matrix.length; i++) {   // Iterating over each row.
    let row = '';
    for (let j = 0; j < matrix[i].length; j++) {  // Iterating over each element in the row.
        row += `${matrix[i][j]} `; 
    }
    console.log(row);
}
/*
Prints:
1 2 3
4 5 6
7 8 9
*/

for (let i = 1; i <= 5; i++) { // The first loop denotes each level of the pyramid.
    let row = '';
    for (let j = 1; j <= i; j++) { // The second loop adds numbers to each level.
        row += `${j} `;
    }
    console.log(row); // Prints each level of the pyramid.
}

/*
Prints:
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
*/