How should you build the code segment?

DRAG DROP

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, drag the appropriate word to the correct location in the code segment. Each word may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

View Answer

Answer:

Explanation:

* 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