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Base Conversion

/ Published in: JavaScript
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This is a quick & easy system for changing the base of any number.

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  1. // Sample usage for decimal to hex: base(255, '0123456789ABCDEF') == 'FF'
  2. // Common conversions such as above are easy to wrap with a helper function to speed use
  3. function base(dec,base){
  4. 	var len=base.length;
  5. 	var ret='';
  6. 	while(dec>0){
  7. 		ret = base.charAt(dec%len) + ret;
  8. 		dec = Math.floor(dec/len);
  9. 	}
  10. 	return ret;
  11. }
  12.  
  13. // Converts from nondecimal string to decimal
  14. // Example: unbase('FF', '0123456789ABCDEF') == 255
  15. function unbase(num, base){
  16. 	var len=base.length;
  17. 	var ret=0;
  18. 	for(var x=1;num.length>0;x*=len){
  19. 		ret += base.indexOf(num.charAt(num.length-1)) * x
  20. 		num = num.substr(0,num.length-1);
  21. 	}
  22. 	return ret;
  23. }

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