How to filter a word using array.filter method

Question

I simply want to know how to return the indexes of the objects whose name property is equal to "Bob" using the filter method. (in this case one Index for simplicity)

data.json

[
 {
    "index": "14",
    "name": "Bob",
    "age": "23",
  },
  {
    "index": "23",
    "name": "John",
    "age": "30",
  },
  {
    "index": "17",
    "name": "Bob",
    "age": "25",
  },
]

app.js

const data = require("./data.json");


const searchword = "Bob";
const result = data.filter((word) => ???word === searchword???);
console.log(result);

Should show index:14,17

Jamiec · Accepted Answer · 2021-05-05 15:42:51Z

1

This is as simple as a filter and a map

const data = [
 {
    "index": "14",
    "name": "Bob",
    "age": "23",
  },
  {
    "index": "23",
    "name": "John",
    "age": "30",
  },
  {
    "index": "17",
    "name": "Bob",
    "age": "25",
  },
]

const searchWord = "Bob";
const result = data.filter(x => x.name == searchWord) // find by searchWord
                   .map(x => x.index); // get the index
console.log(result.join(",")); // result is an array

answered May 5, 2021 at 15:42

Jamiec

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Comments

Siva Kondapi Venkata · Accepted Answer · 2021-05-05 16:43:53Z

0

Using reduce method

const data = [
  {
    index: "14",
    name: "Bob",
    age: "23",
  },
  {
    index: "23",
    name: "John",
    age: "30",
  },
  {
    index: "17",
    name: "Bob",
    age: "25",
  },
];

const getIndexes = (arr, word) =>
  arr.reduce(
    (acc, { index, name }) => (name === word ? acc.concat(index) : acc),
    []
  ).toString();

console.log(getIndexes(data, "Bob"));

answered May 5, 2021 at 16:43

Siva Kondapi Venkata

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