Web Development Quiz

What does `let` do in JavaScript?

• Declares a constant variable

• Declares a block-scoped variable

• Declares a global variable

• Creates a function

Which operator is used for strict equality?

• =

• ==

• ===

• :=

What is the output of `typeof null`?

• null

• object

• undefined

• string

What does `parseInt("10.5")` return?

• 10.5

• 10

• 11

• NaN

What is the result of `true && false`?

• false

• true

• null

• undefined

Which function is used to delay execution?

• delay()

• setTimeout()

• setInterval()

• wait()

What is the output of `Boolean(0)`?

• 0

• false

• true

• null

Which method adds an element to the end of an array?

• pushFront()

• push()

• insert()

• append()

What does `map()` do in JavaScript arrays?

• Filters elements

• Sorts elements

• Transforms each element and returns a new array

• Modifies the original array

Which symbol starts a comment in JavaScript?

• #

• //

• %%

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