Implement Deep Filter | AWS Frontend Interview Question | JavaScript | Problem Solving | Amazon

In this question, you must implement a function that takes two arguments object and filter function, then returns a filtered object.

Syntax

filter(collection, callback);

Arguments

• collection (Object): The collection to iterate over
• callback (Function) => (Boolean): The function invoked over every element

Return

• Object: Returns the filtered object

Examples

const input = {
  a: 1,
  b: {
    c: 2,
    d: -3,
    e: {
      f: {
        g: -4,
      },
    },
    h: {
      i: 5,
      j: 6,
    },
  }
};

const callback = element => element >= 0;

function filter(input, callback) {
  // filtering logic here
}

const filtered = filter(input, callback);

// { a: 1, b: { c: 2, h: { i: 5, j: 6 } } }
console.log(filtered);

const input = {
  a: 1,
  b: {
    c: 'Hello World',
    d: 2,
    e: {
      f: {
        g: -4,
      },
    },
    h: 'Good Night Moon',
  },
}

const callback = element => typeof element === "string";

function filter(input, callback) {
  // filtering logic here
}

const filtered = filter(input, callback);

// { b: { c: 'Hello World', h: 'Good Night Moon' } } 
console.log(filtered);

Submission

Start the timer, complete your solution, test your solution against the test cases provided by the platform, and submit it. Ideally, you should finish this question within 30 mins. Share your solution with us -- https://twitter.com/devtoolstech