flow/tests/core_tests/map.js at v0.37 · dominictobias/flow

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// @flow

function* generator(): Iterable<[string, number]> {

while (true) {

yield ['foo', 123];

}

let tests = [

// good constructors

function() {

let w = new Map();

let x = new Map(null);

let y = new Map([['foo', 123]]);

let z = new Map(generator());

let a: Map<string, number> = new Map();

let b: Map<string, number> = new Map([['foo', 123]]);

let c: Map<string, number> = new Map(generator());

// bad constructors

function() {

let x = new Map(['foo', 123]); // error

let y: Map<number, string> = new Map([['foo', 123]]); // error

// get()

function(x: Map<string, number>) {

(x.get('foo'): boolean); // error, string | void

x.get(123); // error, wrong key type

];