Infosys Certified TypeScript Developer

Mr.Joe was learning TypeScript technology. Can you help him to recognize the object-oriented term that is supported by TypeScript but not by JavaScript?

Mr. Joe was designing a TypeScript application for a ABC company which consists of parameters empName and empNo. Can you select the datatype which would help him to implement this requirement?

What will be the output of the below-given TypeScript code?

var num1:number=5; 
function ab():void{ 
var num1:number=3; 
console.log(num1); 
} 
console.log(num1); 
ab(); 
console.log(num1);

Predict the output of the following code.

Line 1: function getStatusData() { 
Line 2: var tempCounter = 10; 
Line 3: console.log(tempCounter);
Line 4: } 
Line 5: console.log(tempCounter >= 10 ? 'Active' : 'Inactive');

Select the TypeScript datatype which is similar to ‘Any’ datatype but that can be used for safer alternative requirement when developer is unknown about the type usage.

Can you predict the invalid TypeScript invalid data type from the below-given options?

Sam, a TypeScript developer is working on creating a registration portal for his college event. He has created a user object as shown below. When he used it to write the logic for further processing, he found that there are redundant code.

Modify the given TypeScript code to remove the redundancy.

let userObj : {userName : string, uid : number | string}; 
function registerUser(user : {userName : string, uid : number | string}){ 
user.userName = userObj.userName; 
user.uid = userObj.uid; 
}

What is the output of the following TypeScript code?

type Point = [number, number?, number]; 
let point : Point = [10, 20]; 
console.log(point);

Predict the output of the following code.

Line 1: let details : [number, string] ;
Line 2: details = ["Tom", 1002] ;
Line 3: details.push("Sam") ;
Line 4: console.log(details);

Which of the following options represents the advantages of using TypeScript Type aliasing feature?