• Underscore _.any is Lodash _.some
• 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 _.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 _.object is Lodash _.zipObject
• Underscore _.pairs is Lodash _.toPairs
• Underscore _.pluck is Lodash _.map
• 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 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 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 is _.take(array, 2) in Lodash)