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var aFunction = require('./_a-function')
, toObject = require('./_to-object')
, IObject = require('./_iobject')
, toLength = require('./_to-length');
module.exports = function(that, callbackfn, aLen, memo, isRight){
aFunction(callbackfn);
var O = toObject(that)
, self = IObject(O)
, length = toLength(O.length)
, index = isRight ? length - 1 : 0
, i = isRight ? -1 : 1;
if(aLen < 2)for(;;){
if(index in self){
memo = self[index];
index += i;
break;
}
index += i;
if(isRight ? index < 0 : length <= index){
throw TypeError('Reduce of empty array with no initial value');
}
}
for(;isRight ? index >= 0 : length > index; index += i)if(index in self){
memo = callbackfn(memo, self[index], index, O);
}
return memo;
};
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