Aditya Bansal maddymanu
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| // Introduction | |
| type Human = { | |
| name: string, | |
| age: number | |
| } | |
| type Alien = { | |
| name: string, | |
| planet: string | |
| } |
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| // Practical example | |
| //https://www.typescriptlang.org/docs/handbook/advanced-types.html#union-types | |
| function padLeft(value: string, padding: string | number) { | |
| if (typeof padding === "number") { | |
| return Array(padding + 1).join(" ") + value; | |
| } | |
| if (typeof padding === "string") { | |
| return padding + value; | |
| } | |
| throw new Error(`Expected string or number, got '${padding}'.`); |
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| //Discriminated Unions | |
| type Human2 = { | |
| kind: 'human', | |
| name: string, | |
| age: number, | |
| } | |
| type Alien2 = { | |
| kind: 'alien', | |
| name: string, |
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| type InternalError = { | |
| kind: 'internalerror', | |
| error: string, | |
| details?: string[] | |
| } | |
| type BadDataError = { | |
| kind: 'baddata', | |
| error: string, | |
| data: any |
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| type Human2 = { | |
| kind: 'human', | |
| name: string, | |
| age: number, | |
| } | |
| type Alien2 = { | |
| kind: 'alien', | |
| name: string, | |
| planet: string |
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| "use strict"; | |
| function sayHello2(named) { | |
| switch (named.kind) { | |
| case "human": | |
| console.log(`Hi ${named.name}`); | |
| break; | |
| case 'alien': | |
| console.log(`Hi ${named.name} from ${named.planet}`); | |
| break; | |
| } |