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JavaScript: Generate an array of specified length, the content of the array is integer numbers, increase by one from starting

JavaScript Array: Exercise-40 with Solution

Write a JavaScript function to generate an array of specified length, filled with integer numbers, increase by one from starting position.

Test Data :
console.log(array_range(1, 4));
[1, 2, 3, 4]
console.log(array_range(-6, 4));
[-6, -5, -4, -3]

Pictorial Presentation:

JavaScript: Generate an array of specified length, the content of the array is integer numbers, increase by one from starting

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript function to generate an array of given length, the content of the array is integer numbers, increase by one from starting</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function array_range(start, len) 
     {
		var arr = new Array(len);
		for (var i = 0; i < len; i++, start++) 
        {
			arr[i] = start;
		}
      		return arr;
}


console.log(array_range(1, 4));

console.log(array_range(-6, 4));

Sample Output:

[1,2,3,4]
[-6,-5,-4,-3]

Flowchart:

Flowchart: JavaScript: Generate an array of specified length, filled with integer numbers, increase by one from starting

ES6 Version:

function array_range(start, len) 
     {
		const arr = new Array(len);
		for (let i = 0; i < len; i++, start++) 
        {
			arr[i] = start;
		}
      		return arr;
}


console.log(array_range(1, 4));

console.log(array_range(-6, 4));

Live Demo:

See the Pen JavaScript - Generate an array of specified length, the content of the array is integer numbers, increase by one from starting-array-ex- 40 by w3resource (@w3resource) on CodePen.


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Next: Write a JavaScript function to generate an array between two integers of 1 step length.

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JavaScript: Tips of the Day

JavaScript: Shorten an array using its length property

A great way of shortening an array is by redefining its length property.

let array = [0, 1, 2, 3, 4, 5, 6, 6, 8, 9]
array.length = 4
// Result: [0, 1, 2, 3]

Important to know though is that this is a destructive way of changing the array. This means you lose all the other values that used to be in the array.

Ref: https://bit.ly/2LBj213