Learn how to create an Immutable.Map() through plain Javascript object construction and also via array tuples.

 

console.clear();// Can be an objectvar map = Immutable.Map({key: "value"});console.log(map.get("key")); //"value"// Can be an arrayvar map = Immutable.Map([["key", {"name": "Zhentian"}]]);console.log(map.get("key").name); //"Zhentian"// size propconsole.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();