不可變的JS更新地圖中的所有對象

Question

我有這張地圖：

map1:{
    x: {...}
    y: {...}
    h: {...}
    j: {...}
    k: {...}
}

如何更新一個公共屬性，例如為地圖中的所有對象“選擇”，並盡可能快地對不可變js響應redux js？

謝謝。

Answer 1

const { fromJS } = require('immutable');

let state = fromJS({
  map1: {
    x: { selected: false},
    y: { selected: false}
  }
});

console.log(state.update('map1', item => item.map( 
  keyValue => keyValue.set('selected', true)
)).toJS());

//result:{ map1: { x: { selected: true }, y: { selected: true } } }

//Have not tried other different methods to test speed, 
//since the field is not deep-nested, it should be fast enough, Hope this may help, :)