Deep Omit

mediumcodingJavaScriptObjectsRecursion~25 min

Asked at Google, Meta, Amazon

Overview

Implement deepOmit(object, keys) that recursively removes all specified keys from a nested object.

Examples

deepOmit({ a: 1, b: { c: 2, a: 3 }}, ['a']); // { b: { c: 2 }}

Solution

Reveal solution

function deepOmit(object, keys) {
  if (object === null || typeof object !== 'object') return object;
  if (Array.isArray(object)) return object.map(item => deepOmit(item, keys));
  const result = {};
  const keySet = new Set(keys);
  for (const [k, v] of Object.entries(object)) {
    if (!keySet.has(k)) result[k] = deepOmit(v, keys);
  }
  return result;
}

deep-omit.js

Deep Omit

mediumcodingJavaScriptObjects

Overview

Implement deepOmit(object, keys) that recursively removes all specified keys from a nested object.

Examples

deepOmit({ a: 1, b: { c: 2, a: 3 }}, ['a']); // { b: { c: 2 }}

Solution

Reveal solution

function deepOmit(object, keys) {
  if (object === null || typeof object !== 'object') return object;
  if (Array.isArray(object)) return object.map(item => deepOmit(item, keys));
  const result = {};
  const keySet = new Set(keys);
  for (const [k, v] of Object.entries(object)) {
    if (!keySet.has(k)) result[k] = deepOmit(v, keys);
  }
  return result;
}

NameTopicDifficulty

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