Javascript ES6

Question 1

function that allows a short syntax for writing function expressions.

Answer 1

Arrow Function
hello = () => {
return “Hello World!”;
}

Question 2

The statement that allows you to declare a variable with block scope.

Answer 2

let

Question 3

The statement that allows you to declare a variable with a constant value

Answer 3

const

Question 4

A type of function, but instead of using the keyword function to initiate it, we use a different keyword, and the properties are assigned inside a constructor() method.

Answer 4

Class
class Car {
  constructor(brand) {
    this.carname = brand;
  }
}

Question 5

Giving function parameters default values

Answer 5

function mine(x, y = 10) {
}

Question 6

Array method that returns the value of the first array element that passes a test function

Answer 6

find()
var numbers = [4, 9, 16, 25, 29];
var first = numbers.find(myFunction);

function myFunction(value, index, array) {
  return value > 18;
}

Question 7

Array method that returns the index of the first array element that passes a test function

Answer 7

findIndex()
var numbers = [4, 9, 16, 25, 29];
var first = numbers.findIndex(myFunction);

function myFunction(value, index, array) {
  return value > 18;
}

Question 8

Number property that represents the difference between 1 and the smallest floating point number greater than 1. It has the value of 2.2204460492503130808472633361816E-16, or 2-52.

Answer 8

Number.EPSILON

Question 9

Number property that represents the minimum safe integer in JavaScript (-(2^53 - 1))

Answer 9

Number.MIN_SAFE_INTEGER

Question 10

Number property that represents the maximum safe integer in JavaScript (2^53 - 1)

Answer 10

Number.MAX_SAFE_INTEGER

Question 11

Number method that determines whether the passed value is an integer

Answer 11

Number.isInteger()

Question 12

Number method that determines whether the passed value is a safe integer

Answer 12

Number.isSafeInteger()

Question 13

Global Number method that determines whether the passed value is a finite number

Answer 13

Number.isFinite()

Question 14

Global Number method that determines whether a value is NaN (not-a-number)

Answer 14

Number.isNaN()

Question 15

Exponentiation operator to raise the first operand to the power of the second operand and produces the same result as Math.pow()

Answer 15

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