error alert message js typeof code example
Example 1: js typeof number
console.log(typeof 93);
// Output = "number"
console.log(typeof 'Maximum');
// Output = 'string'
console.log(typeof false);
// Output = "boolean"
console.log(typeof anUndeclaredVariable);
// Output = "undefined"
Example 2: check data type in javascript
typeof("string"); //string
typeof(123); //number