Queue类报错了
来源：2-12 泛型（Generics） 第三部分 - 类和接口
linsky
2021-06-07
老师您好。运行时报错了
class Queue22<T> {
private data = [];
push(item: T) {
return this.data.push(item)
}
pop(): T {
return this.data.shift()
}
}
const queue22 = new Queue22<number>()
queue.push(1)
报错信息
/usr/local/lib/node_modules/ts-node/src/index.ts:587
return new TSError(diagnosticText, diagnosticCodes);
^
TSError: ⨯ Unable to compile TypeScript:
test-g.ts:4:29 - error TS2345: Argument of type 'T' is not assignable to parameter of type 'never'.
4 return this.data.push(item)
~~~~
test-g.ts:7:7 - error TS2322: Type 'undefined' is not assignable to type 'T'.
'T' could be instantiated with an arbitrary type which could be unrelated to 'undefined'.
7 return this.data.shift()
~~~~~~~~~~~~~~~~~~~~~~~~
at createTSError (/usr/local/lib/node_modules/ts-node/src/index.ts:587:12)
at reportTSError (/usr/local/lib/node_modules/ts-node/src/index.ts:591:19)
at getOutput (/usr/local/lib/node_modules/ts-node/src/index.ts:921:36)
at Object.compile (/usr/local/lib/node_modules/ts-node/src/index.ts:1189:32)
at Module.m._compile (/usr/local/lib/node_modules/ts-node/src/index.ts:1295:42)
at Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
at Object.require.extensions.<computed> [as .ts] (/usr/local/lib/node_modules/ts-node/src/index.ts:1298:12)
at Module.load (internal/modules/cjs/loader.js:863:32)
at Function.Module._load (internal/modules/cjs/loader.js:708:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12)
node: v12.20.0
tsc: v4.3.2
写回答
1回答
-
张轩
2021-06-08
同学你好 应该是typescript 版本问题，在这里要指定一下数组类型，我简单修改了一下，没有报错啦。
class Queue22<T> { private data:Array<T> = []; push(item: T) { return this.data.push(item) } pop() { return this.data.shift() } } const queue22 = new Queue22<number>() queue22.push(1) const poped = queue22.pop()10
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