3
How to Check if a Variable is an Integer in JavaScript
source link: https://masteringjs.io/tutorials/fundamentals/is-integer
Go to the source link to view the article. You can view the picture content, updated content and better typesetting reading experience. If the link is broken, please click the button below to view the snapshot at that time.
How to Check if a Variable is an Integer in JavaScript
Jan 13, 2022
To check if a variable is an integer in JavaScript, use Number.isInteger().
Number.isInteger() returns true or false depending on the parameter provided.
let example = 12.1;
Number.isInteger(example); // false
example = 12;
Number.isInteger(example); // true
example = Infinity;
Number.isInteger(example); // falseNon-numeric values will return false, even if the value is an instance of the Number class.
Number.isInteger(null); // false
Number.isInteger('42'); // false
Number.isInteger(new Number(5)); // falseRemember that JavaScript can only represent up to 16 decimal places, so Number.isInteger() may return surprising results in cases where JavaScript doesn't have sufficient numeric precision to represent the output.
let example = 5 + 1e-16;
Number.isInteger(example); // true
example = 5 + 5e-16;
Number.isInteger(example); // falseMore Fundamentals Tutorials
Recommend
About Joyk
Aggregate valuable and interesting links.
Joyk means Joy of geeK