aaac7fed
 liuqimichale
add
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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")
, objHasOwnProperty = Object.prototype.hasOwnProperty
, max = Math.max
, min = Math.min;
module.exports = function (target, start /*, end*/) {
var arr = validValue(this)
, end = arguments[2]
, length = toPosInt(arr.length)
, to
, from
, fin
, count
, direction;
target = toInteger(target);
start = toInteger(start);
end = end === undefined ? length : toInteger(end);
to = target < 0 ? max(length + target, 0) : min(target, length);
from = start < 0 ? max(length + start, 0) : min(start, length);
fin = end < 0 ? max(length + end, 0) : min(end, length);
count = min(fin - from, length - to);
direction = 1;
if (from < to && to < from + count) {
direction = -1;
from += count - 1;
to += count - 1;
}
while (count > 0) {
if (objHasOwnProperty.call(arr, from)) arr[to] = arr[from];
else delete arr[from];
from += direction;
to += direction;
count -= 1;
}
return arr;
};
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