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// Taken from: https://github.com/paulmillr/es6-shim/
'use strict';
var toInteger = require('../../../number/to-integer')
, toPosInt = require('../../../number/to-pos-integer')
, validValue = require('../../../object/valid-value')
, hasOwnProperty = Object.prototype.hasOwnProperty
, max = Math.max, min = Math.min;
module.exports = function (target, start/*, end*/) {
var o = validValue(this), end = arguments[2], l = toPosInt(o.length)
, to, from, fin, count, direction;
target = toInteger(target);
start = toInteger(start);
end = (end === undefined) ? l : toInteger(end);
to = target < 0 ? max(l + target, 0) : min(target, l);
from = start < 0 ? max(l + start, 0) : min(start, l);
fin = end < 0 ? max(l + end, 0) : min(end, l);
count = min(fin - from, l - to);
direction = 1;
if ((from < to) && (to < (from + count))) {
direction = -1;
from += count - 1;
to += count - 1;
}
while (count > 0) {
if (hasOwnProperty.call(o, from)) o[to] = o[from];
else delete o[from];
from += direction;
to += direction;
count -= 1;
}
return o;
};
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