Moderate JavaScript Question 206 of 229

What is the spread operator used for?

Frontend Master · Speak this in 60–90 seconds · Faridabad & Delhi NCR

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Spread copies array or object properties into a new literal.

Why interviewers care about JavaScript:

JavaScript questions separate people

who only read docs from people who shipped.

Keep it short, concrete,

and tied to Frontend work.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

Before you speak the answer, walk the interviewer through these steps:

1
Spread copies array or
object properties into a new literal.
2
I use it to
clone shallowly, merge props, or pass array items as arguments.
3
It does not deep-clone
nested objects, which is a common follow-up trap.
4
Give an example
One tiny concrete case you can say aloud.
5
Common mistake
What juniors usually get wrong.
6
Close
When you pick this over the alternative.

Here's a short line you can speak, broken into clear beats:

Say this line

“I use it to clone shallowly, merge props, or pass array items as arguments.”

Break into beats

Iuseittocloneshallowly

Speaking order

2987408337471632900

Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

Spread copies array or object properties into a new literal. I use it to clone shallowly, merge props, or pass array items as arguments.