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