├── README
└── dollars.js


/README:
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1 | This is a custom library I'm starting that will include all kinds of javascript snippets I find useful.
2 | 
3 | I will add them all to one file. They will possibly depend on Underscore.js and jQuery.js, and all of the functions will be attached to the "dollars" variable $$.
4 | 
5 | This library is definitely not meant for production but rather for fast prototyping. Afterwards one could pick and choose the parts that are used.


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/dollars.js:
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 1 | $$ = dollars = {};
 2 | 
 3 | // Formatting Methods
 4 | dollars.formatSize = function(size, precisionArg, thresholdArg) {
 5 |   var units = " bytes, KB, MB, GB".split(",");
 6 |   var precision = precisionArg || 1;
 7 |   var threshold = thresholdArg || 500;
 8 |   var kilo = 1024;
 9 | 
10 |   for (var dim = 0; dim < units.length-1; dim++) {
11 |     if (size < threshold) {
12 |       return (size % 1 ? size.toFixed(precision) : size) + units[dim];
13 |     } else {
14 |       size = size / kilo;
15 |     }
16 |   }
17 | 
18 |   return size.toFixed(precision) + units.pop();
19 | }
20 | 
21 | // Creates a copy from `collection` with only the key-value
22 | // pairs specified by `keys`.
23 | //
24 | // Example:
25 | //
26 | //  var obj = {name: "David", age: 25, email: "david@crowdway.com"};
27 | //  $$.filterKeys(obj, ["name", "age"]);
28 | //  // This would return
29 | //  { name: "David", age: 25 }
30 | dollars.filterKeys = function(collection, keys, predicate) {
31 |   var results = {};
32 |   var predicateArg = predicate || _.include;
33 | 
34 |   _.each(collection, function(value, key) {
35 |     if (predicateArg(keys, key)) {
36 |       results[key] = value;
37 |     }
38 |   });
39 |   
40 |   return results;
41 | }
42 | 
43 | // Does the opposite of `filterKeys`: creates a new object
44 | // containing key-values that were not in keys.
45 | dollars.withoutKeys = function(collection, keys) {
46 |   return dollars.filterKeys(collection, keys, function(a, b) {
47 |     return !_.include(a, b);
48 |   });
49 | }


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