CODEWITHSUNDEEP
javascriptobjectoutput
sd_30
sd_30

Reputation: 678

how to get the following output of the code snippet?

I have been asked this question in an interview. How to solve this? The object and consoles statements are mentioned. I am not getting how to implement the function findPath? Code snippet

Upvotes: 1

Views: 773

Answers (4)

Harvinder Singh
Harvinder Singh

Reputation: 2069

A simple approach

const obj = {
  a: {
    b: {
      c: 12,
    },
  },
  k: null,
};

const testFunc = (obj, k) => {
  const arr = k.split(".");
  for (let i = 0; i < arr.length; i++) {
    obj = obj[arr[i]];
  }
  return obj;
};

console.log(testFunc(obj, "k")); //null
console.log(testFunc(obj, "a.b.c")); //12
console.log(testFunc(obj, "a.b.c.d")); //undefined
console.log(testFunc(obj, "f")); //undefined

Upvotes: 0

waseemrakab
waseemrakab

Reputation: 312

This could do it

var obj = {
  a: {
    b: {
      c: 1
    }
  }
}
function findPath(path) {
  const paths = path.split('.');
  let innerObj = {...obj};
  for (let i = 0; i < paths.length; i++) {
    innerObj = innerObj && innerObj[paths[i]] || null;
  }
  return innerObj;
}

console.log(findPath("a.b.c"));
console.log(findPath("a.b"));
console.log(findPath("a.b.d"));
console.log(findPath("a.c"));
console.log(findPath("a.b.c.d"));
console.log(findPath("a.b.c.d.e"));

Upvotes: 0

Ketan Ramteke
Ketan Ramteke

Reputation: 10655

class Obj {
  constructor() {
    this.data = {
      a: {
        b: {
          c: 12
        }
      }
    };
  }

  findPath = (str) => {
    let sol = this.data;
    for (let key of str.split(".")) {
      sol = sol[key];
      if (!sol) {
        return undefined;
      }
    }
    return JSON.stringify(sol);
  };
}

let obj = new Obj();
console.log(obj.findPath("a.b.c"));
console.log(obj.findPath("a.b"));
console.log(obj.findPath("a.b.d"));
console.log(obj.findPath("a.c"));
console.log(obj.findPath("a.b.c.d"));
console.log(obj.findPath("a.b.c.d.e"));

Upvotes: 3

buzatto
buzatto

Reputation: 10382

var obj = {
  a: {
    b: {
      c: 1
    }
  }
}

obj.findPath = function(path) {
  const keys = path.split('.');
  return keys.reduce((currentPath, key) => {
    return currentPath && currentPath[key]
  }, this) 
}

console.log(obj.findPath('a'))
console.log(obj.findPath('a.b'))
console.log(obj.findPath('a.b.c'))
console.log(obj.findPath('a.b.c.d'))

Upvotes: 3

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