Learn TypeScript: The Complete Course for Beginners Educative Quiz Answers

Get Learn TypeScript: The Complete Course for Beginners Educative Quiz Answers

If you’re looking to move beyond vanilla JavaScript and take your skills to the next level, then you’ve come to the right place. TypeScript is an in-demand language that sits on top of JavaScript. This means you can do everything you can in JavaScript with TypeScript, but also enjoy countless other perks including support for JS libraries, NPM, static typing, and much more.

In this course, you’ll start from the beginning and work your way up to more advanced concepts like type checking, iterators, and manipulating objects and arrays. You’ll get a chance to get your hands dirty with plenty of real practice along the way.

For JavaScript developers, TypeScript is a must-know language, not only for today but also for years to come. Don’t miss out.

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Quiz 1: Mutable and Immutable Arrays

Q1. What is the type of the following array?

let multipleTypeArray = [1, true, 3];
  • any
  • number
  • number or boolean

Quiz 2: Mutable and Immutable Arrays

Q1. What is the inferred type by the control flow analysis for this array?

let myArray = [];
myArray[0] = 5;
myArray[1] = "aString";
myArray[2] = true;
  • any[]
  • (number | string | boolean)[]

Q2. What is the infered type by the control flow analysis for this array at line #1?

let myArray = []; // LINE #1
myArray.push(1);  // LINE #2
myArray;          // LINE #3
  • any[]
  • number[]

Q3. What is the infered type by the control flow analysis for this array at line #2?

let myArray = []; // LINE #1
myArray.push(1);  // LINE #2
myArray;          // LINE #3
  • any[]
  • number[]

Q4. What is the infered type by the control flow analysis for this array at line #3?

let myArray = []; // LINE #1
myArray.push(1);  // LINE #2
myArray;          // LINE #3
  • any[]
  • number[]
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