Exam 70-480 topic 1 question 22 discussion

HOTSPOT -
You are creating a function by using JavaScript. The function accepts an object as the parameter and returns a string that identifies the data type of the object.
You have the following requirements:
✑ The function must return "Number" if the object is a number.
✑ The function must return "String" if the object is a string.
✑ The function must return "Unknown" if the object is neither a number nor a string.
You need to implement the function to meet the requirements.
How should you build the code segment? (To answer, select the appropriate options from the drop-down lists in the answer area.)
Hot Area:

Suggested Answer:
* Use the switch statement to select one of many blocks of code to be executed.

Syntax -
switch(expression) {
case n:
code block
break;
case n:
code block
break;
default:
default code block
}
This is how it works:
The switch expression is evaluated once.
The value of the expression is compared with the values of each case.
If there is a match, the associated block of code is executed.
* Object.prototype.constructor
Returns a reference to the Object function that created the instance's prototype. Note that the value of this property is a reference to the function itself, not a string containing the function's name. The value is only read-only for primitive values such as 1, true and "test".
* Description
All objects inherit a constructor property from their prototype: var o = {}; o.constructor === Object; // true var a = []; a.constructor === Array; // true var n = new Number(3); n.constructor === Number; // true
* The constructor property is created together with the function as a single property of func.prototype.
Reference: JavaScript Switch Statement;Object.prototype.constructor