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- Object.defineProperty(Number.prototype, Symbol.iterator, {
- *value({ start = 0, step = 1 } = {}) {
- var inc = this > 0 ? step : -step;
- for (let itr = start; Math.abs(itr) < Math.abs(this); itr += inc) {
- yield itr;
- }
- },
- enumerable: false,
- writable: true,
- configurable: true
- });
- [ ...8 ]; // [0,1,2,3,4,5,6,7,8]
- [ ...5[Symbol.iterator]({ start: 3 }) ]; // [3,4,5]
- [ ...10[Symbol.iterator]({ start: 2, step: 4 }) ]; // [2,6,10]
- [ ...-3 ]; // [0,-1,-2,-3]
- [ ...(-3)[Symbol.iterator]({ start: 3, step: 2 }) ]; // [3,1,-1,-3]
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