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How many properties are there in window.performance object?

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How many properties are there in window.performance object?

(a) 1

(b) 4

(c) 2

(d) 3

The question was asked during an interview for a job.

This is a very interesting question from Integrating the Performance Object with perfLogger in chapter Invocation and Performance Navigation of JavaScript

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The correct choice is (c) 2

Easy explanation: The Window interface’s performance property returns a Performance object, which can be used to gather performance information about the current document. There are totally 2 properties associated with the window.performance and they are:

navigation

type.

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