84 lines
2.1 KiB
Text
84 lines
2.1 KiB
Text
|
=== tests/cases/compiler/contextualSignatureInstantiation3.ts ===
|
||
|
function map<T, U>(items: T[], f: (x: T) => U): U[]{
|
||
|
>map : <T, U>(items: T[], f: (x: T) => U) => U[]
|
||
|
>T : T
|
||
|
>U : U
|
||
|
>items : T[]
|
||
|
>T : T
|
||
|
>f : (x: T) => U
|
||
|
>x : T
|
||
|
>T : T
|
||
|
>U : U
|
||
|
>U : U
|
||
|
|
||
|
return items.map(f);
|
||
|
>items.map(f) : U[]
|
||
|
>items.map : <U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any) => U[]
|
||
|
>items : T[]
|
||
|
>map : <U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any) => U[]
|
||
|
>f : (x: T) => U
|
||
|
}
|
||
|
|
||
|
function identity<T>(x: T) {
|
||
|
>identity : <T>(x: T) => T
|
||
|
>T : T
|
||
|
>x : T
|
||
|
>T : T
|
||
|
|
||
|
return x;
|
||
|
>x : T
|
||
|
}
|
||
|
|
||
|
function singleton<T>(x: T) {
|
||
|
>singleton : <T>(x: T) => T[]
|
||
|
>T : T
|
||
|
>x : T
|
||
|
>T : T
|
||
|
|
||
|
return [x];
|
||
|
>[x] : T[]
|
||
|
>x : T
|
||
|
}
|
||
|
|
||
|
var xs = [1, 2, 3];
|
||
|
>xs : number[]
|
||
|
>[1, 2, 3] : number[]
|
||
|
|
||
|
// Have compiler check that we get the correct types
|
||
|
var v1: number[];
|
||
|
>v1 : number[]
|
||
|
|
||
|
var v1 = xs.map(identity); // Error if not number[]
|
||
|
>v1 : number[]
|
||
|
>xs.map(identity) : number[]
|
||
|
>xs.map : <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]
|
||
|
>xs : number[]
|
||
|
>map : <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]
|
||
|
>identity : <T>(x: T) => T
|
||
|
|
||
|
var v1 = map(xs, identity); // Error if not number[]
|
||
|
>v1 : number[]
|
||
|
>map(xs, identity) : number[]
|
||
|
>map : <T, U>(items: T[], f: (x: T) => U) => U[]
|
||
|
>xs : number[]
|
||
|
>identity : <T>(x: T) => T
|
||
|
|
||
|
var v2: number[][];
|
||
|
>v2 : number[][]
|
||
|
|
||
|
var v2 = xs.map(singleton); // Error if not number[][]
|
||
|
>v2 : number[][]
|
||
|
>xs.map(singleton) : number[][]
|
||
|
>xs.map : <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]
|
||
|
>xs : number[]
|
||
|
>map : <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => U[]
|
||
|
>singleton : <T>(x: T) => T[]
|
||
|
|
||
|
var v2 = map(xs, singleton); // Error if not number[][]
|
||
|
>v2 : number[][]
|
||
|
>map(xs, singleton) : number[][]
|
||
|
>map : <T, U>(items: T[], f: (x: T) => U) => U[]
|
||
|
>xs : number[]
|
||
|
>singleton : <T>(x: T) => T[]
|
||
|
|