- 1: number, undefined, string, object - 2: undefined, undefined, string, object - 3: number, number, string, object - 4: number, number, number, number

##### Answer: 3 If the function argument is set implicitly(not passing argument) or explicitly to undefined, the value of the argument is the default parameter. Whereas for other falsy values('' or null), the value of the argument is passed as a parameter. Hence, the result of function calls categorized as below, 1. The first two function calls logs number type since the type of default value is number 2. The type of '' and null values are string and object type respectively.

JavaScript Coding Exercise 39 | JSCodingQuestions.com

javascript

1function checkType(num = 1) {
2
3console.log(typeof num);
4}
5
6checkType();
7
8checkType(undefined);
9
10checkType("");
11
12checkType(null);

Choose the correct output:

number, undefined, string, object

undefined, undefined, string, object

number, number, string, object

number, number, number, number