Infosys Certified L2 Junior React Developer

What is the primary function of the forEach() method ?

When should you use the "let" keyword instead of the "var" keyword ?

What is the difference between the scoping of a "let" and a "var" declared variable ?

What is the output of the following code snippet ?

enum cricketers { Sachin = 10, Rahul, Sourav = Rahul + 15 };
console.log(cricketers.Sourav);

What is the output of the following code snippet ?

let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9];
let result = numbers.find(number => number % 2 == 0);
console.log(result);

What is the output of the following code snippet ?

let states = ["Maharashtra", "Gujarat", "Kerala", "Punjab"];
let result = states.filter(state => state.length > 8);
console.log(result);

Consider the following TypeScript code snippet. What will be logged to the console?

let arr: number[] = [1, 2, 3, 4];

let newArr: number[] = arr;

newArr[0] = 0;

console.log(arr[0]);

What will be the output of the following TypeScript code?

let fruits: string[] = ["apple", "orange", "banana"];

let removed = fruits.splice(1, 1, "grape", "kiwi");

console.log(removed.length);

What will be logged to the console in the following TypeScript code?

let nums: number[] = [1, 2, 3, 4, 5];

let sliced = nums.slice(1, 3);

console.log(nums.length);

What is the output of the following TypeScript code?

function mystery(a: number, b: number, ...rest: number[]): number {

return a * b + rest.reduce((acc, val) => acc + val, 0);

}

const result = mystery(2, 3, 4, 5);

console.log(result);