Lodash interview questions

Implement lodash xor — return the values that appear in exactly one of the given arrays, with duplicates removed.

Implement lodash keyBy — index a collection into an object keyed by an iteratee's return, keeping the last item for each key.

Implement lodash sumBy and meanBy — total and average an array by an iteratee that maps each element to a number.

Convert any string between camelCase, snake_case, kebab-case, and PascalCase by tokenizing it into words first.

Implement lodash-style set and unset: write or delete a value at a deep object path, creating containers as needed.

Implement lodash pull and pullAll — remove every occurrence of the given values from an array in place, mutating the original.

Implement lodash truncate — cut a string to a maximum length, append an ellipsis, and optionally break on the last word boundary before the limit.