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JavaScript function query

[CODE lang="javascript" highlight="1,3"]const timeFuncRuntime = funcParameter => {
let t1 = Date.now();
let t2 = Date.now();
return t2 - t1;

const addOneToOne = () => 1 + 1;


Why is written line 3 " funcParameter(); " in block code of function???? Is line3 parameter ???? Why is it return with parentheses , though it is parameteras as per line1???
What is this function supposed to be doing? The call on line 3 looks like the function is calling itself, but I'm not sure what the end result of this code is supposed to be? Is this supposed to be just timing how long the function takes to complete?

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