ParseFloat

From PlainOldWebserver

parseFloat()

 var one = parseFloat("3e-3");
 var two = parseFloat("23.354");
 var three = parseFloat("tr34");
 var four = parseFloat("34.4r");
 var five = parseFloat(" 34.4 ");
 document.writeln("one is "+one);
 document.writeln("two is "+two);
 document.writeln("three is "+three);
 document.writeln("four is "+four);
 document.writeln("five is "+five);

Result:

 one is 0.003
 two is 23.354
 three is NaN
 four is 34.4
 five is 34.4

Note that leading alphabetical characters will not produce a desired result.