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JavaScript: Find the maximum number from a given positive integer by deleting exactly one digit of the given number

JavaScript Basic: Exercise-103 with Solution

Write a JavaScript program to find the maximum number from a given positive integer by deleting exactly one digit of the given number.

Pictorial Presentation:

JavaScript: Find the maximum number from a given positive integer by deleting exactly one digit of the given number.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title> Find the maximum number from a given positive integer by deleting exactly one digit of the given number</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function digit_delete(num) {
    var result = 0,
        num_digits = [];
    while (num) {
        num_digits.push(num % 10);
        num = Math.floor(num / 10);
    }
    for (var index_num = 0; index_num < num_digits.length; index_num++) {
        var n = 0;
        for (var i = num_digits.length - 1; i >= 0; i--) {
            if (i !== index_num) {
                n = n * 10 + num_digits[i];
            }
        }
        result = Math.max(n, result);
    }
    return result;
}

console.log(digit_delete(100));
console.log(digit_delete(10));
console.log(digit_delete(1245));

Sample Output:

10
1
245

Flowchart:

Flowchart: JavaScript - Find the maximum number from a given positive integer by deleting exactly one digit of the given number

ES6 Version:

function digit_delete(num) {
    let result = 0;
    const num_digits = [];
    while (num) {
        num_digits.push(num % 10);
        num = Math.floor(num / 10);
    }
    for (let index_num = 0; index_num < num_digits.length; index_num++) {
        let n = 0;
        for (let i = num_digits.length - 1; i >= 0; i--) {
            if (i !== index_num) {
                n = n * 10 + num_digits[i];
            }
        }
        result = Math.max(n, result);
    }
    return result;
}

console.log(digit_delete(100));
console.log(digit_delete(10));
console.log(digit_delete(1245));

Live Demo:

See the Pen javascript-basic-exercise-103 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript program to find the number of inversions of a given array of integers.
Next: Write a JavaScript program to find two elements of the array such that their absolute difference is not greater than a given integer but is as close to the said integer.

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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