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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;
| };
|
|
