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"
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Pictorial Presentation:
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:
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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Next: Write a JavaScript program to find the sum of squares of a numeric vector.
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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
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