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Interview Q&A / JavaScript

INTERVIEW Q&A · 71 QUESTIONS

JavaScript interview questions

Closures, the event loop, this, promises and the core language questions every frontend round asks.

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  1. How is Object.is different from the === operator?

    Object.is works like === with two differences: Object.is(NaN, NaN) is true, and Object.is(0, -0) is false. React uses it to compare state values.

    IntermediateQuick answer1 min read