This is a function to calculate the appropriate unit to describe a file size. If you want a fancier function, try this function: https://gist.github.com/2202887 by @vitronprince
Thanks to maettig for minification tips.
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file Size Unit Calculator
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| function( | |
| a, //number | |
| c //placeholder | |
| ) | |
| { | |
| for(;a>>10;c=-~c)a>>=10; //as long the number is over 1023, divide it by 1024 | |
| //a>>10 is the same as a/1024 (Thanks maettig!) | |
| //also set a counter to +1 | |
| return a+(" kMGT"[c]||"")+"B"} //return final number + the suffix |
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| function(a,c){for(;a>>10;c=-~c)a>>=10;return a+(" kMGT"[c]||"")+"B"} | |
| Shorter version using proper unicode unit symbols: | |
| function(a,c){for(;a>>10;c=-~c)a>>=10;return a+(" ㎅㎆㎇"[c]||"B")} |
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| { | |
| "name": "fileSizeUnits", | |
| "description": "Function to calculate the appropriate unit to describe a file size", | |
| "keywords": [ | |
| "file", | |
| "size", | |
| "units", | |
| "math" | |
| ] | |
| } |
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| <!DOCTYPE html> | |
| <title>file Size Unit Calculator</title> | |
| <div>Expected value: <b>269MB</b></div> | |
| <div>Actual value: <b id="ret"></b></div> | |
| <script> | |
| var fileSizeUnits = function(a,c){for(;a>>10;c=-~c)a>>=10;return a+(" kMGT"[c]||"")+"B"} | |
| document.getElementById( "ret" ).innerHTML = fileSizeUnits(282630144) | |
| </script> |
@maettig
GENIUS!
right shift operator ftw!
not sure about "[c|0]" tho... "|" isn't the same as "||"
example:
20||18 = 20
20|18 = 22
Yea, but it's |0. It's there because c may be "undefined" and must be converted to "0". You can do the same with ~~c.
Edit: I'm wondering about the space. Is it intended to have a space in "15 B" but not in "15MB"?
@maettig quote:"I'm wondering about the space. Is it intended to have a space in "15 B" but not in "15MB"?"
Oops! Thats a bug alright, I'll go and fix it. :P
Edit: Fixd!
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What about this? Saves 3 bytes. I'm not sure if it works in all cases.