[Javascript] Creating an Immutable Object Graph with Immutable.js Map()
2023-09-14 08:59:20 时间
Learn how to create an Immutable.Map() through plain Javascript object construction and also via array tuples.
console.clear(); // Can be an object var map = Immutable.Map({key: "value"}); console.log(map.get("key")); //"value" // Can be an array var map = Immutable.Map([["key", {"name": "Zhentian"}]]); console.log(map.get("key").name); //"Zhentian" // size prop console.log(map.size); //1
mocha.setup('bdd'); const expect = chai.expect; function createObjTodos(numTodos) { var obj = {} _.each(_.range(numTodos), (index) => { const todoSequence = String(index+1); obj['todo'+todoSequence] = { title: 'Todo '+todoSequence, value: `Make ${todoSequence} happen` }; }); return obj; } describe('Creating an Immutable Object Graph with Immutable.js Map()', () => { it('should create Map() with matching keys', () => { const data = { "todo1": { title: "Todo 1", value: "Make it happen" }, "todo2": { title: "Todo 2", value: "Make it happen" } } let map = Immutable.Map(data); expect(map.get("todo1").title).to.equal("Todo 1"); }); it('should create Map() with keys from array tuples', () => { let map = Immutable.Map([["todo1", {title: "Todo 1"}]]) // Note the array within array expect(map.get("todo1").title).to.equal("Todo 1"); }); it('should create Map() with matching size to number of keys', () => { let map = Immutable.Map(createObjTodos(3)) expect(map.size).to.equal(3); }); }); mocha.run();
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