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Javascript Questions Set 160:

Quiz Mode

How to check if an object is an Array or not?

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What is the output of the following code?


var x = 20;
{
var x = 21;
}

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Which of the following variable declaration keywords will have the same scope as 'let'?

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Which is the method used to add an event listener?

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JavaScript entities start with & and end with ;

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What will be the output of the following JavaScript function?

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What is the advantage of the code produced graphics being smaller than the images themselves?

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Identify the React hook which customizes the instance value that is exposed to parent components when using ref.

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In the following switch syntax, the expression is compared with the case labels using which of the following operator(s)?


 switch(expression)

 {   

        statements

 } 

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The snippet that filters the filtered set is _____

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