JavaScript: Check whether a given integer has an increasing digits sequence

JavaScript Basic: Exercise-119 with Solution

Check if Digits in Integer Are Increasing

Write a JavaScript program to check if a given integer has an increasing digit sequence.

Visual Presentation:

Sample Solution:

JavaScript Code:

// Function to check if the digits of a number form an increasing sequence
function is_increasing_digits_Sequence(num) {
  var arr_num = ('' + num).split(''); // Convert the number to a string and split it into an array of digits

  // Loop through the array of digits
  for (var i = 0; i < arr_num.length - 1; i++) {
    // Check if the current digit is greater than or equal to the next digit
    if (parseInt(arr_num[i]) >= parseInt(arr_num[i + 1])) {
      return false; // If the sequence is not increasing, return false
    }
  }
  return true; // If the sequence is increasing, return true
}

// Test cases
console.log(is_increasing_digits_Sequence(123));    // Output: true (Each digit forms an increasing sequence)
console.log(is_increasing_digits_Sequence(1223));   // Output: false (Digits are not in strictly increasing order)
console.log(is_increasing_digits_Sequence(45677));  // Output: false (Digits are not in strictly increasing order)

Output:

true
false
false

Live Demo:

See the Pen javascript-basic-exercise-119 by w3resource (@w3resource) on CodePen.

Flowchart:

ES6 Version:

// Function to check if the digits of a number form an increasing sequence
const is_increasing_digits_Sequence = (num) => {
  const arr_num = `${num}`.split(''); // Convert the number to a string and split it into an array of digits

  // Loop through the array of digits
  for (let i = 0; i < arr_num.length - 1; i++) {
    // Check if the current digit is greater than or equal to the next digit
    if (parseInt(arr_num[i]) >= parseInt(arr_num[i + 1])) {
      return false; // If the sequence is not increasing, return false
    }
  }
  return true; // If the sequence is increasing, return true
};

// Test cases
console.log(is_increasing_digits_Sequence(123));    // Output: true (Each digit forms an increasing sequence)
console.log(is_increasing_digits_Sequence(1223));   // Output: false (Digits are not in strictly increasing order)
console.log(is_increasing_digits_Sequence(45677));  // Output: false (Digits are not in strictly increasing order)

For more Practice: Solve these Related Problems:

• Write a JavaScript program that checks if the digits of an integer form a strictly increasing sequence.
• Write a JavaScript function that converts a number to an array of digits and verifies each digit is larger than its predecessor.
• Write a JavaScript program that returns true if an integer’s digits are in ascending order, and false otherwise, handling single-digit inputs.

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• JavaScript basic Exercises Home ↩
• JavaScript Exercises Home ↩

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