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JavaScript: Convert a value to a safe integer

JavaScript fundamental (ES6 Syntax): Exercise-29 with Solution

Write a JavaScript program to convert a value to a safe integer.

  • Use Math.max() and Math.min() to find the closest safe value.
  • Use Math.round() to convert to an integer.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const to_Safe_Integer = num =>
 Math.round(Math.max(Math.min(num, Number.MAX_SAFE_INTEGER), Number.MIN_SAFE_INTEGER));
console.log(to_Safe_Integer('5.2'));
console.log(to_Safe_Integer('5.52'));
console.log(to_Safe_Integer(Infinity)); 

Sample Output:

5
6
9007199254740991

Flowchart:

flowchart: Convert a value to a safe integer.

Live Demo:

See the Pen javascript-basic-exercise-1-29 by w3resource (@w3resource) on CodePen.


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Next: Write a JavaScript program to filter out the element(s) of an given array, that have one of the specified values.

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JavaScript: Tips of the Day

How to remove a specific item from an array?

Find the index of the array element you want to remove using indexOf, and then remove that index with splice.

The splice() method changes the contents of an array by removing existing elements and/or adding new elements.

const array = [2, 5, 9];

console.log(array);

const index = array.indexOf(5);
if (index > -1) {
  array.splice(index, 1);
}

// array = [2, 9]
console.log(array);

The second parameter of splice is the number of elements to remove. Note that splice modifies the array in place and returns a new array containing the elements that have been removed.

For the reason of completeness, here are functions. The first function removes only a single occurrence (i.e. removing the first match of 5 from [2,5,9,1,5,8,5]), while the second function removes all occurrences:

function removeItemOnce(arr, value) {
  var index = arr.indexOf(value);
  if (index > -1) {
    arr.splice(index, 1);
  }
  return arr;
}

function removeItemAll(arr, value) {
  var i = 0;
  while (i < arr.length) {
    if (arr[i] === value) {
      arr.splice(i, 1);
    } else {
      ++i;
    }
  }
  return arr;
}
//Usage
console.log(removeItemOnce([2,5,9,1,5,8,5], 5))
console.log(removeItemAll([2,5,9,1,5,8,5], 5))

Ref: https://bit.ly/2N9nKRp