1. add
    1. #
  2. all
    1. >
    2. C
  3. alter
    1. >
    2. C
  4. any
    1. >
    2. C
  5. append
    1. S
  6. appendAll
    1. >
    2. A
  7. appendOne
    1. A
  8. assignDefaults
    1. >
    2. K
  9. assignOverrides
    1. >
    2. K
  10. compareByPath
  11. compareByProp
  12. compose
    1. >
  13. containedIn
    1. @
  14. contains
    1. >
    2. &
  15. dateIsBetween
    1. D
  16. defaultFalseyValTo
    1. @
  17. defaultNullishValTo
    1. @
  18. discard
    1. >
    2. C
  19. discardFirst
    1. >
    2. Q
  20. discardFirstWhile
    1. >
    2. A
  21. discardLast
    1. >
    2. Q
  22. discardLastWhile
    1. >
    2. A
  23. discardRange
    1. A
  24. discardWhen
    1. >
    2. C
  25. divideBy
    1. #
  26. endsWith
    1. S
  27. expand
    1. >
    2. S
  28. expandEnd
    1. >
    2. S
  29. expandStart
    1. >
    2. S
  30. fillRangeWith
    1. A
  31. fillWith
    1. A
  32. find
    1. C
  33. findKey
    1. E
  34. findKeyWithVal
    1. >
    2. $
  35. findLast
    1. A
  36. findLastKey
    1. >
    2. A
  37. findLastKeyWithVal
    1. >
    2. Q
  38. first
    1. >
    2. Q
  39. flattenFully
    1. A
  40. flattenOnce
    1. A
  41. flattenToDepth
    1. A
  42. forEach
    1. C
  43. get
    1. @
  44. getAtPath
    1. @
  45. getAverageValue
  46. getCommonValues
    1. >
  47. getExclusiveValues
  48. getKeys
    1. E
  49. getMaxValue
    1. C
  50. getMinValue
    1. C
  51. getRandomValue
    1. C
  52. getSize
    1. &
  53. getValueAtMapKey
    1. P
  54. getValues
    1. E
  55. greaterThan
    1. #
  56. greaterThanOrEqualTo
    1. #
  57. groupBy
    1. C
  58. invert
    1. K
  59. invokeWith
    1. F
  60. isAfter
    1. D
  61. isAtOrAfter
    1. D
  62. isAtOrBefore
    1. D
  63. isBefore
    1. D
  64. isEmpty
    1. &
  65. isFalsey
    1. @
  66. isLaden
    1. &
  67. isTruthy
    1. @
  68. joinValues
    1. C
  69. keep
    1. C
  70. keepFirst
    1. >
    2. Q
  71. keepFirstWhile
    1. >
    2. A
  72. keepLast
    1. >
    2. Q
  73. keepLastWhile
    1. >
    2. A
  74. keepRange
    1. Q
  75. keepWhen
    1. C
  76. last
    1. Q
  77. lessThan
    1. #
  78. lessThanOrEqualTo
    1. #
  79. mAppendAll
    1. M
    2. A
  80. mAppendOne
    1. M
    2. A
  81. mAssignDefaults
    1. M
    2. K
  82. mAssignOverrides
    1. M
    2. K
  83. mDiscardFirst
    1. >
    2. M
    3. A
  84. mDiscardFirstWhile
    1. >
    2. M
    3. A
  85. mDiscardLast
    1. >
    2. M
    3. A
  86. mDiscardLastWhile
    1. >
    2. M
    3. A
  87. mDiscardRange
    1. M
    2. A
  88. mFillRangeWith
    1. M
    2. A
  89. mFillWith
    1. M
    2. E
  90. mKeepFirst
    1. >
    2. M
    3. A
  91. mKeepFirstWhile
    1. >
    2. M
    3. A
  92. mKeepLast
    1. >
    2. M
    3. A
  93. mKeepLastWhile
    1. >
    2. M
    3. A
  94. mKeepRange
    1. M
    2. A
  95. mMapValues
    1. M
    2. E
  96. mOmit
    1. M
    2. E
  97. mOrder
    1. M
    2. A
  98. mPick
    1. M
    2. E
  99. mPrependAll
    1. M
    2. A
  100. mPrependOne
    1. M
    2. A
  101. mReverse
    1. M
    2. A
  102. mSet
    1. M
  103. mSetAtPath
    1. M
  104. mShuffle
    1. M
    2. A
  105. mUpdate
    1. M
    2. E
  106. mapKeys
    1. K
  107. mapValues
    1. C
  108. multiplyBy
    1. #
  109. negate
  110. numberIsBetween
    1. #
  111. omit
    1. E
  112. order
    1. A
  113. pAll
    1. >
    2. ǁ
    3. C
  114. pAny
    1. >
    2. ǁ
    3. C
  115. pCompose
    1. >
    2. ǁ
  116. pDiscardWhen
    1. >
    2. ǁ
    3. C
  117. pFind
    1. >
    2. ǁ
    3. C
  118. pForEach
    1. >
    2. ǁ
    3. C
  119. pKeepWhen
    1. >
    2. ǁ
    3. C
  120. pMapValues
    1. >
    2. ǁ
    3. C
  121. pPassThrough
    1. ǁ
  122. pResolveValues
    1. >
    2. ǁ
    3. C
  123. pWaitMs
    1. ǁ
  124. passThrough
  125. peek
    1. >
    2. @
  126. pick
    1. E
  127. prepend
    1. S
  128. prependAll
    1. >
    2. A
  129. prependOne
    1. A
  130. prune
    1. >
    2. S
  131. pruneEnd
    1. >
    2. S
  132. pruneStart
    1. >
    2. S
  133. randomlyKeep
    1. C
  134. replaceAllMatches
    1. >
    2. S
  135. replaceFirstMatch
    1. >
    2. S
  136. returnFirstArg
    1. >
    2. @
  137. returnUndefined
    1. >
  138. reverse
    1. A
  139. roundToNearest
    1. #
  140. set
    1. E
  141. shuffle
    1. A
  142. split
    1. S
  143. splitEvery
    1. >
    2. Q
  144. startsWith
    1. S
  145. strictEquals
    1. @
  146. subtract
    1. #
  147. sumValues
    1. C
  148. swapFirstTwoArgs
    1. F
  149. transpose
    1. >
  150. truncateToNChars
    1. S
  151. truncateToNLines
    1. S
  152. update
    1. E
  153. withDatesAscending
  154. withDatesDescending
  155. withNumbersAscending
  156. withNumbersDescending
  157. withStringsAscending
  158. withStringsDescending

isTruthy

isTruthy

  • (value: any) => boolean

  1. Test whether a value is truthy

    Try It
    isTruthy('a') // is true
isTruthy(1) // is true

isTruthy(undefined) // is false
isTruthy('') // is false
isTruthy(0) // is false
isTruthy('a') // is true
isTruthy(1) // is true

isTruthy(undefined) // is false
isTruthy('') // is false
isTruthy(0) // is false
    Try It
    isTruthy('a') // is true
isTruthy(1) // is true

isTruthy(undefined) // is false
isTruthy('') // is false
isTruthy(0) // is false
isTruthy('a') // is true
isTruthy(1) // is true

isTruthy(undefined) // is false
isTruthy('') // is false
isTruthy(0) // is false

  2. Sometimes we need to handle truthy values. Below, we have applicants compiled from multiple sources. If a field is truthy, that means the data was compiled successfully. Let's clean our data by only keeping the truthy fields.

    Try It
    const applicants = {
  chris: {
    yearsExperience: undefined,
    applied: '2025 02 15',
  },
  liz: {
    yearsExperience: '2',
    applied: '',
  },
}

const keepTruthyFields = keepWhen(isTruthy)
const cleanApplicants = mapValues(keepTruthyFields)
const updatedApplicants = cleanApplicants(applicants)
console.log(updatedApplicants)
// is {
//   chris: {
//     applied: 2025 02 15
//   }
//   liz: {
//     yearsExperience: 2
//   }
// }
type Applicant = {
  yearsExperience?: string
  applied?: string
}
type Applicants = Record<string, Applicant>
const applicants: Applicants = {
  chris: {
    yearsExperience: undefined,
    applied: '2025 02 15',
  },
  liz: {
    yearsExperience: '2',
    applied: '',
  },
}

const keepTruthyFields = keepWhen(isTruthy)<Applicant>
const cleanApplicants = mapValues(keepTruthyFields)<Applicants>
const updatedApplicants = cleanApplicants(applicants)
console.log(updatedApplicants)
// is {
//   chris: {
//     applied: 2025 02 15
//   }
//   liz: {
//     yearsExperience: 2
//   }
// }
    Try It
    const applicants = {
  chris: {
    yearsExperience: undefined,
    applied: '2025 02 15',
  },
  liz: {
    yearsExperience: '2',
    applied: '',
  },
}

const keepTruthyFields = keepWhen(isTruthy)
const cleanApplicants = mapValues(
  keepTruthyFields
)
const updatedApplicants =
  cleanApplicants(applicants)
console.log(updatedApplicants)
// is {
//   chris: {
//     applied: 2025 02 15
//   }
//   liz: {
//     yearsExperience: 2
//   }
// }
type Applicant = {
  yearsExperience?: string
  applied?: string
}
type Applicants = Record<string, Applicant>
const applicants: Applicants = {
  chris: {
    yearsExperience: undefined,
    applied: '2025 02 15',
  },
  liz: {
    yearsExperience: '2',
    applied: '',
  },
}

const keepTruthyFields = keepWhen(
  isTruthy
)<Applicant>
const cleanApplicants = mapValues(
  keepTruthyFields
)<Applicants>
const updatedApplicants =
  cleanApplicants(applicants)
console.log(updatedApplicants)
// is {
//   chris: {
//     applied: 2025 02 15
//   }
//   liz: {
//     yearsExperience: 2
//   }
// }