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

Generate Integer Range Array

Write a JavaScript function to generate an array of integer numbers, increasing one from the starting position, of a specified length.

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

Visual Presentation:

Sample Solution:

JavaScript Code:

// Function to generate an array of numbers in a specified range
function array_range(start, len) 
{
  // Create a new array with the specified length
  var arr = new Array(len);

  // Iterate through the array, filling it with values incremented from 'start'
  for (var i = 0; i < len; i++, start++) 
  {
    arr[i] = start;
  }

  // Return the generated array
  return arr;
}

// Output the result of generating an array with a starting value of 1 and a length of 4
console.log(array_range(1, 4));

// Output the result of generating an array with a starting value of -6 and a length of 4
console.log(array_range(-6, 4));

Output:

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

Flowchart:

ES6 Version:

// Function to generate an array of numbers in a specified range
function array_range(start, len) 
{
  // Create a new array with the specified length using Array.from
  const arr = Array.from({ length: len }, (_, index) => start + index);

  // Return the generated array
  return arr;
}

// Output the result of generating an array with a starting value of 1 and a length of 4
console.log(array_range(1, 4));

// Output the result of generating an array with a starting value of -6 and a length of 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.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that generates an array of consecutive integers starting from a given number with a specified length.
• Write a JavaScript function that uses Array.from() to create a range of integers between two values.
• Write a JavaScript function that uses a for loop to populate an array with consecutive numbers until the desired length is reached.
• Write a JavaScript function that validates the starting value and length, returning an error for invalid inputs.

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