JavaScript: Construct a pattern, using a nested for loop

Last update on May 30 2022 10:05:34 (UTC/GMT +8 hours)

JavaScript Conditional Statement and loops: Exercise-10 with Solution

Write a JavaScript program to construct the following pattern, using a nested for loop.

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

Pictorial Presentation:

JavaScript: Construct a pattern, using a nested for loop

Sample Solution:-

HTML Code:


<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS nested for loop example</title>
</head>
<body>
  
</body>
</html>

JavaScript Code:


var x,y,chr;
for(x=1; x <=6; x++)
{
   for (y=1; y < x; y++)
     {
    chr=chr+("*");        
      }
 console.log(chr);
 chr='';    
}

Flowchart:

Flowchart: JavaScript:- Construct a pattern, using a nested for loop

Live Demo:

See the Pen javascript-conditional-statements-and-loops-exercise-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