Tested functions, copied into your project.

All functions

• number/parse

  • stable
  • TS

  type ParseNumber = (input: string) => number | null

  Convert a string to a finite number, or null when the string is not a decimal number.

  npx toopo add number/parse

• number/round

  • stable
  • TS

  type Round = (value: number, places: number) => number | null

  Round a number to a fixed number of decimal places, or null when the call cannot be answered.

  npx toopo add number/round

• date/add

  • stable
  • TS

  type AddToDate = (date: Date, duration: Duration) => Date | null

  Add a duration to a Date and get a new Date back, in UTC, without mutating the input, or null when the call cannot be answered exactly - with a named reason available beside it for a caller who needs to know which refusal it was.

  npx toopo add date/add

• string/levenshtein

  • stable
  • TS

  type Levenshtein = (a: string, b: string) => number

  Count the single-character insertions, deletions and substitutions that turn one string into the other, counting in Unicode code points.

  npx toopo add string/levenshtein

• string/slugify

  • stable
  • TS

  type Slugify = (text: string) => string

  Turn text into a URL-safe identifier: one lower-case run of letters, marks and digits per word, joined by single hyphens. The output is Unicode, not ASCII.

  npx toopo add string/slugify

• object/deep-equal

  • stable
  • TS

  type DeepEqual = (left: unknown, right: unknown) => boolean

  Compare two values by the data they carry rather than by reference, walking into arrays, objects, Map, Set, typed arrays, Date, RegExp and Error, terminating on graphs that return to themselves, and never writing to either argument.

  npx toopo add object/deep-equal