Shows values with units and multipliers, i.e., 760 Mibytes or 12 km.
If the unit is binary, «i» is appended to multiplier as suggested by IEC and IEEE.
| function( | |
| a, /* value */ | |
| b, /* number of decimal digits */ | |
| c, /* unit */ | |
| d /* isDecimal */ | |
| ){ | |
| with(Math) /* Lookup properties in Math object */ | |
| return | |
| /* Get the multipler: log(n,m) = log(n,e) / log(m,e) */ | |
| /* I can hardly make it readable */ | |
| /* Divide the original value into power of.. */ | |
| (a / pow( | |
| /* ..base that becomes 1024 if unit is binary and 1000 if decimal */ | |
| d = 1E3 + 24*!d, | |
| /* `a` is used already, so we can assign to it. It is the multiplier */ | |
| /* log via log use the d calculated just before */ | |
| /* And then coerce to integer n^0 is like ~~n but has MUCH lower priority | |
| so we can omit the parens */ | |
| a = log(a)/log(d) ^0 | |
| /* Then convert to fixed number using b as parameter */ | |
| )).toFixed(b) + | |
| /* Just a typography: add the whitespace.*/ | |
| ' ' + | |
| /* Split string by regexp: use dash or nothing */ | |
| /* ['','k','G','T'] Hope, T it is enough for now */ | |
| /* then picking a letter depending on `a` */ | |
| 'kMGT'.charAt(a-1) + // Thanks @maettig for getting rid of regexp here | |
| /* Append "i" if unit is binary and multiplier is more than 0 */ | |
| /* In details: | |
| We're already redefined d to be 1000 or 1024. | |
| 1000 & 8 makes 8 | |
| 1024 & 8 makes 0 | |
| !a makes 0 or 1 | |
| So the possible values of d&8|!a are: | |
| 0, 1, 8, 9 | |
| then it is coerced to boolean | |
| */ | |
| (d & 8 | !a ? '' : 'i') + | |
| /* Append a unit or "bytes" if it is undefined */ | |
| /* This function is primarily designed for bytes */ | |
| (c || 'bytes') | |
| /* -- end of return -- */ | |
| /* -- end of with -- */ | |
| } |
| function(a,b,c,d){with(Math)return(a/pow(d=1E3+24*!d,a=log(a)/log(d)^0)).toFixed(b)+' '+'kMGT'.charAt(a-1)+(d&8|!a?'':'i')+(c||'bytes')} |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2011 subzey <[email protected]> | |
| Everyone is permitted to copy and distribute verbatim or modified | |
| copies of this license document, and changing it is allowed as long | |
| as the name is changed. | |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
| 0. You just DO WHAT THE FUCK YOU WANT TO. |
| { | |
| "name": "unitDisplay", | |
| "description": "Displays value with unit and multipler", | |
| "keywords": [ | |
| "units", | |
| "multipliers" | |
| ] | |
| } |
| <!DOCTYPE html> | |
| <title>Foo</title> | |
| <div>Expected value: <b>140 bytes,11.77 Mibytes,9 km</b></div> | |
| <div>Actual value: <b id="ret"></b></div> | |
| <script> | |
| // write a small example that shows off the API for your example | |
| // and tests it in one fell swoop. | |
| var myFunction = function(a,b,c,d){with(Math)return(a/pow(d=1E3+24*!d,a=log(a)/log(d)^0)).toFixed(b)+' '+'kMGT'.charAt(a-1)+(d&8|!a?'':'i')+(c||'bytes')} | |
| document.getElementById( "ret" ).innerHTML = [myFunction(140), myFunction(12345678,2), myFunction(9001,null,'m',true)] | |
| </script> |
It is! Thanks, @maettig!