parseFloat

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parse with no px
var pcode = 'p'.charCodeAt(0);
var xcode = 'x'.charCodeAt(1);

for (var i = 0; i < 200; i++) {
  var s = i + "px";
  //if(s.charCodeAt(s.length-2) === pcode && s.charCodeAt(s.length-1) === xcode) 
  s = s.slice(0,-2);
  parseFloat(s);
}
ready
parse with px
for (var i = 0; i < 200; i++) {
  var s = i + "px";
  parseFloat(s);
}
ready

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