Another interesting technique I spotted in the gRaphaël code base is the use of a prefixed + used to cast a variable to a numeric type.
var data = [ undefined, null, 1, 10.2, new Date() ];
for (var i = 0, len = data.length; i < len; i++)
console.log('cast %o: %o', data[i], +data[i]);
If you run [...]
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