Q201 What does the floor() function do?

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Rounds a number down:

<script language="JavaScript"><!--
alert(Math.floor(0.9));  // returns 0
alert(Math.floor(1.9));  // returns 1
alert(Math.floor(1));    // returns 1
alert(Math.floor(-1.9);  // returns -2
alert(Math.floor(-0.01); // returns -1
//--></script>