Infosys Certified TypeScript Professional

What is the reason for the compiler throwing errors in the following TypeScript code snippet?

function calculateArea(length:number, breadth:number) { 
return length * breadth; 
} 

Assume that you provide “abc” and 5 as the input to the function calculateArea.

What is the purpose of the tsconfig.json file in a TypeScript project?

A TypeScript developer must declare a block-level scoped variable named – myVar in the application. Can you select the appropriate option that would help to achieve this requirement?

1. var myVar:number = 123;
2. let myVar:number = 123;
3. const myVar:number =123;
4. myVar:number=123;

What should be added in Line 2 to get the output as 200?

Line 1: let uniqueId: number[] | string = 'P1200';
Line 2: _______;
Line 3: console.log(uniqueId.pop());

Given below is the content of the tsconfig.json file that a developer has written for their TypeScript application.

{   
    "compilerOptions": {  
            "target": "es5",   
            "watch":true
        },   
    "files": [    
            "demo1.ts",	
            "demo2.ts"   
    ]
}

What will be the output when the developer runs the command ‘tsc’ on the terminal?

Assume that a TypeScript application has two files – demo1.ts and demo2.ts in the root folder. The given below is the content of tsconfig.json file of that application.

{
  "compilerOptions": {
    "target": "es5",
    "outDir": "Output",
  }
}

What will be the output when the developer enters the command ‘tsc’ on the command line?

Given below is the content of the tsconfig.json file that a developer has written for their TypeScript application.

{   
    "compilerOptions": {  
            "target": "es5",   
            "outDir": "Output",  
            "sourceMap": true,
        },   
    "files": [    
            "demo1.ts",	
            "demo2.ts"   
    ]
}

What will be the output when the developer runs the command ‘tsc’ on the terminal?

Assume that your team is developing a TypeScript application. Your team member is using the below command for transpiling the code.

tsc demo.ts --module amd --target ES2015 --outDir output --sourceMap

He finds it difficult that he has to enter all these configuration options each time he does the transpilation. Suggest a better way to help him achieve the requirement.

Predict the output of the following code.

Line 1: let tempCounter = 0; 
Line 2: function getStatusData() { 
Line 3: var tempCounter = 10; 
Line 4: tempCounter++ 
Line 5: console.log(tempCounter >= 10 ? 'Active' : 'Inactive'); 
Line 6: } 
Line 7: console.log(tempCounter >= 10 ? 'Active' : 'Inactive'); 
Line 8: getStatusData();