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30 lines
588 B
30 lines
588 B
function prop (object, name, f) {
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Object.defineProperty(object, name, {
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configurable: true,
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enumerable: true,
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get: function () {
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let value = f.call(this)
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this[name] = value
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return value
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},
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set: function (value) {
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Object.defineProperty(this, name, {
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configurable: true,
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enumerable: true,
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value: value,
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writable: true
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})
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}
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})
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}
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function value (f) {
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let value
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return function () {
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if (value !== undefined) return value
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value = f()
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return value
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}
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}
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module.exports = { prop, value }
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