JS Concepts Quiz

Which of the following is a correct way to declare a variable in JavaScript?

• `var myVariable;`

• `variable myVariable;`

• `v myVariable;`

• `myVariable var;`

What data type is `true` in JavaScript?

• String

• Number

• Boolean

• Object

Which of the following is a valid way to define a function in JavaScript?

• `function myFunction() {}`

• `def myFunction() {}`

• `func myFunction() {}`

• `function: myFunction() {}`

What will be the output of the following code? ```javascript let x = 5; { let x = 10; } console.log(x); ```

• 5

• 10

• undefined

• Error

Which of the following is a correct way to write an if statement in JavaScript?

• `if x = 5 {}`

• `if (x == 5) {}`

• `if x == 5 {}`

• `if (x = 5) {}`

What will be the output of the following code? ```javascript let x = 10; if (x > 5) { x = x + 5; } else { x = x - 5; } console.log(x); ```

• 5

• 10

• 15

• 20

Which loop will execute at least once regardless of the condition?

• `for` loop

• `while` loop

• `do...while` loop

• `foreach` loop

What is the correct syntax for a `for` loop in JavaScript?

• `for (i = 0; i < 5; i++) {}`

• `for i = 0 to 5 {}`

• `for (i < 5; i++) {}`

• `for (i = 0; i < 5) {}`

How do you access the third element in an array named `myArray`?

• `myArray[2]`

• `myArray[3]`

• `myArray(2)`

• `myArray.get(2)`

Which method can be used to add an element to the end of an array?

• `push()`

• `pop()`

• `shift()`

• `unshift()`