JavaScript: Print the elements of an array

JavaScript Array: Exercise-10 with Solution

Print Nested Array Elements

Write a JavaScript program that prints the elements of the following array.

Note : Use nested for loops.
Sample array : var a = [[1, 2, 1, 24], [8, 11, 9, 4], [7, 0, 7, 27], [7, 4, 28, 14], [3, 10, 26, 7]];
Sample Output :
"row 0"
" 1"
" 2"
" 1"
" 24"
"row 1"
------
------

Visual Presentation:

Sample Solution:

JavaScript Code:

// Declare and initialize a sample 2-D array
var a = [[1, 2, 1, 24], [8, 11, 9, 4], [7, 0, 7, 27], [7, 4, 28, 14], [3, 10, 26, 7]];

// Iterate through each row in the 2-D array
for (var i in a) {
   // Output the current row index
   console.log("row " + i);
   
   // Iterate through each element in the current row
   for (var j in a[i]) {
      // Output the current element value
      console.log(" " + a[i][j]);
   }
}

Output:

row 0
 1
 2
 1
 24
row 1
 8
 11
 9
 4
row 2
 7
 0
 7
 27
row 3
 7
 4
 28
 14
row 4
 3
 10
 26
 7

Flowchart:

ES6 Version:

// Declare and initialize a sample 2-D array
const a = [
  [1, 2, 1, 24],
  [8, 11, 9, 4],
  [7, 0, 7, 27],
  [7, 4, 28, 14],
  [3, 10, 26, 7]
];
// Iterate through each row in the 2-D array
for (const i in a) {
  // Output the current row index
  console.log(`row ${i}`);
  // Iterate through each element in the current row
  for (const j in a[i]) {
    // Output the current element value
    console.log(` ${a[i][j]}`);
  }
}

Live Demo:

See the Pen JavaScript - Print the elements of an array- array-ex- 10 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that prints all elements of a nested array using recursion for arbitrary depths.
• Write a JavaScript function that traverses a two-dimensional array with nested for loops and logs each element with its row index.
• Write a JavaScript function that formats and prints each row of a nested array with a custom header.
• Write a JavaScript function that flattens a nested array before printing each element on a new line.

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