Javascript library inspired by the R reshape package by Hadley Wickham.
Melt provides two functions melt and cast. How do they work?
First, they presume you have your data in the form of a list of objects. That looks like this:
var data = [
{key1: 1, key2: 2},
{key1: 2, key2: 3},
{key1: 3, key2: 5},
];
But if you need the keys to be represented as a value, then melt can come to the rescue. Let's take a look at some examples:
Melt: jsfiddle
Cast: jsfiddle
melt(data, keep, varName, valName, noAddId)
data list of objects - data to meltkeep array of strings - names of object keys to keepvarName string - name of the key to use in the molten objects for the former keys (those not in keep)valName string - name of the key to use in the molten objects for the former valuesnoAddId bool - if truthy, don't add the _id value to the resulting objectcast(data, keep, fun, funArgs ...)
data list of objects - data to castkeep array of strings - names of object keys to keep (the "GROUP BY" keys)fun function - a function used to aggregate values accross grouped objectsfunArgs mixed - arguments to passed to funcast.sum(name, cols) - convience function to summarize data with cast
name string name of resulting object key with sum resultscols string or array - names of keys to totaled in the sum. Key values should respond to +.cast.sum(name) - convience function to sum data with cast
name string - special case of cast.sum(name, cols) name is treated as both name and cols.cast.count(name) - convience function to count data with cast
name string - name of resulting object key with which to count objects with common keep valuesApache 2
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