我如何通过比较 ReactJs 中的另一个数组来呈现数组值

Question

I have certain array from props which is given below

this.props.fruits= [
  {
    source: "Apple",
    code: 101,
  },
  {
    source: "banana",
    code: 105,
  },
  { source: "Mango",
    code: 107,
  },
];

in my state I have to save the code only for send it for back-end my state is given below

this.state ={
   myfruits:[101,105]
}

I have to render the myfruits name in the DOM element example rendering DOM element

My Fruits : Apple , banana

Answer 1

You could make a combination of filter , map and join to get this working.

Example is not React but shows you how this can be achieved.

 const fruits = [ { source: "Apple", code: 101, }, { source: "banana", code: 105, }, { source: "Mango", code: 107, }, ]; const state = [101, 105]; const getFruitNames = () => fruits .filter(({ code }) => state.includes(code)) // Get all fruit objects where the code is also in state .map(({ source }) => source) // Only return the source (name) .join(", "); // Turn into a comma seperated string console.log(`My Fruits: ${getFruitNames()}`);

Answer 2

You can use a combination of filter and map method,

this.props.fruits.filter((fruit) => this.state.myfruits.includes(fruit.code))
          .map((fruit) => fruit.source)

This should solve your problem. You can read more about map and filter here .