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JavaScript: Print the elements of an array

JavaScript Array: Exercise-10 with Solution

Write a JavaScript program which 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"
------
------

Pictorial Presentation:

JavaScript: Print the elements of an array

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Print 2-D array</title>
</head>
<body>
</body>
</html>

JavaScript Code:

// 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]];
 
for (var i in a) 
{
   console.log("row " + i);
   for (var j in a[i]) 
     {
      console.log(" " + a[i][j]);
     }
}

Sample 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:

Flowchart: JavaScript: Display the colors entered in an array by a specific format

ES6 Version:

// 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]];
 
for (const i in a) 
{
   console.log(`row ${i}`);
   for (const j in a[i]) 
     {
      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.


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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04