Differences between Lodash and Underscore.js [closed]

Answer 1

If, like me, you were expecting a list of usage differences between Underscore.js and Lodash, there's a guide for migrating from Underscore.js to Lodash.

Here's the current state of it for posterity:

• Underscore _.any is Lodash _.some
• Underscore _.all is Lodash _.every
• Underscore _.compose is Lodash _.flowRight
• Underscore _.contains is Lodash _.includes
• Underscore _.each doesn’t allow exiting by returning false
• Underscore _.findWhere is Lodash _.find
• Underscore _.flatten is deep by default while Lodash is shallow
• Underscore _.groupBy supports an iteratee that is passed the parameters (value, index, originalArray), while in Lodash, the iteratee for _.groupBy is only passed a single parameter: (value).
• Underscore.js _.indexOf with third parameter undefined is Lodash _.indexOf
• Underscore.js _.indexOf with third parameter true is Lodash _.sortedIndexOf
• Underscore _.indexBy is Lodash _.keyBy
• Underscore _.invoke is Lodash _.invokeMap
• Underscore _.mapObject is Lodash _.mapValues
• Underscore _.max combines Lodash _.max & _.maxBy
• Underscore _.min combines Lodash _.min & _.minBy
• Underscore _.sample combines Lodash _.sample & _.sampleSize
• Underscore _.object combines Lodash _.fromPairs and _.zipObject
• Underscore _.omit by a predicate is Lodash _.omitBy
• Underscore _.pairs is Lodash _.toPairs
• Underscore _.pick by a predicate is Lodash _.pickBy
• Underscore _.pluck is Lodash _.map
• Underscore _.sortedIndex combines Lodash _.sortedIndex & _.sortedIndexOf
• Underscore _.uniq by an iteratee is Lodash _.uniqBy
• Underscore _.where is Lodash _.filter
• Underscore _.isFinite doesn’t align with Number.isFinite
  (e.g. _.isFinite('1') returns true in Underscore.js, but false in Lodash)
• Underscore _.matches shorthand doesn’t support deep comparisons
  (e.g., _.filter(objects, { 'a': { 'b': 'c' } }))
• Underscore ≥ 1.7 & Lodash _.template syntax is
  _.template(string, option)(data)
• Lodash _.memoize caches are Map like objects
• Lodash doesn’t support a context argument for many methods in favor of _.bind
• Lodash supports implicit chaining, lazy chaining, & shortcut fusion
• Lodash split its overloaded _.head, _.last, _.rest, & _.initial out into
  _.take, _.takeRight, _.drop, & _.dropRight
  (i.e. _.head(array, 2) in Underscore.js is _.take(array, 2) in Lodash)