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An implementation of reduce modeled after the underscore.js api that does not default to Array.prototype.reduce.
function reduce(obj, iterator, memo, ctx) {
var keys = Object.keys(obj),
memo = memo || obj[keys[0]];
ctx = ctx || null;
for (var i = arguments[2] ? 0 : 1; i < keys.length; i++)
memo =, memo, obj[keys[i]], keys[i], obj);
return memo;
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