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Missing

Array

_.differenceWith
_.dropRightWhile
_.dropWhile
_.intersectionWith
_.pullAll
_.pullAllBy
_.pullAllWith
_.sortedIndex
_.sortedIndexBy
_.sortedLastIndex
_.sortedLastIndexBy
_.sortedUniqBy
_.takeRightWhile
_.takeWhile
_.unionWith
_.uniqWith
_.unzipWith
_.xorBy
_.xorWith
_.zipObjectDeep
_.zipWith

Collection – only covered arrays so far

_.countBy
_.findLast
_.flatMapDeep
_.flatMapDepth
_.groupBy
_.invokeMap
_.keyBy
_.orderBy
_.partition
_.reject
_.sample
_.sampleSize
_.shuffle
_.sortBy

Function

_.defer
_.memoize
_.throttle

Lang

_.clone
_.cloneDeepWith
_.cloneWith
_.eq
_.isArguments
_.isArrayLike
_.isArrayLikeObject
_.isBuffer
_.isElement
_.isEqual
_.isEqualWith
_.isFunction
_.isLength
_.isMatch
_.isMatchWith
_.isNative
_.isNumber
_.isObjectLike
_.isPlainObject
_.toArray
_.toFinite
_.toInteger
_.toLength
_.toNumber
_.toPlainObject
_.toSafeInteger
_.toString

Object

_.assignIn
_.assignInWith
_.assignWith
_.at
_.defaultsDeep
_.findKey
_.findLastKey
_.forIn
_.forInRight
_.forOwn
_.forOwnRight
_.functions
_.functionsIn
_.hasIn
_.invertBy
_.invoke
_.keysIn
_.mapValues
_.merge
_.mergeWith
_.pickBy
_.result
_.setWith
_.toPairsIn
_.transform
_.update
_.updateWith
_.valuesIn

String

_.camelCase
_.escapeRegExp
_.lowerCase
_.snakeCase
_.startCase
_.template
_.truncate
_.unescape
_.upperCase

Util

_.bindAll
_.conforms
_.iteratee
_.matches
_.matchesProperty
_.method
_.methodOf
_.mixin
_.noConflict
_.property
_.propertyOf
_.runInContext