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27 lines
1.0 KiB
JavaScript
27 lines
1.0 KiB
JavaScript
"use strict";
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const consumable = require("./");
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let singleUseValue = consumable(42);
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console.log(singleUseValue.isSet()); // true
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console.log(singleUseValue.peek()); // 42
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console.log(singleUseValue.consume()); // 42
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console.log(singleUseValue.peek()); // Throws!
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console.log(singleUseValue.isSet()); // false
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/* Now let's try with a different value, and using `replace`... */
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singleUseValue.set(13);
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console.log(singleUseValue.peek()); // 13
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console.log(singleUseValue.replace(9001)); // 13
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console.log(singleUseValue.peek()); // 9001
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/* Note how it can distinguish between an explicitly-set `undefined`, and just nothing being set. */
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singleUseValue.set(undefined);
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console.log(singleUseValue.isSet()); // true
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console.log(singleUseValue.peek()); // undefined
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console.log(singleUseValue.consume()); // undefined
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console.log(singleUseValue.isSet()); // false
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console.log(singleUseValue.peek()); // Throws!
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console.log(singleUseValue.consume()); // Throws!
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