31 lines
864 B
TypeScript
31 lines
864 B
TypeScript
type Guid = string & { $Guid }; // Tagged string type
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type SerialNo = number & { $SerialNo }; // Tagged number type
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function createGuid() {
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return "21EC2020-3AEA-4069-A2DD-08002B30309D" as Guid;
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}
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function createSerialNo() {
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return 12345 as SerialNo;
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}
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let map1: { [x: string]: number } = {};
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let guid = createGuid();
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map1[guid] = 123; // Can with tagged string
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let map2: { [x: number]: string } = {};
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let serialNo = createSerialNo();
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map2[serialNo] = "hello"; // Can index with tagged number
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const s1 = "{" + guid + "}";
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const s2 = guid.toLowerCase();
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const s3 = guid + guid;
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const s4 = guid + serialNo;
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const s5 = serialNo.toPrecision(0);
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const n1 = serialNo * 3;
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const n2 = serialNo + serialNo;
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const b1 = guid === "";
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const b2 = guid === guid;
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const b3 = serialNo === 0;
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const b4 = serialNo === serialNo;
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