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The javascript for in loop loops through the properties of an object.

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In this example script we've created an object variable called Person the object contains three elements

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f name l name and age the for in loop will loop through each item of the object and output the data.

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Let's go ahead and test this in our web browser to see the result.

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We can see that each item in the object has been output.

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John Smith in 30.