CFP - Docs - prune

prune

(pruneArg: Character | Character[]) => (aString: string) => string

Prune characters off the ends of a string

Try It

const pruneDashes = prune('-')

pruneDashes('--abc--') // is 'abc'
const pruneDashes = prune('-')

pruneDashes('--abc--') // is 'abc'

Try It

const pruneDashes = prune('-')

pruneDashes('--abc--') // is 'abc'
const pruneDashes = prune('-')

pruneDashes('--abc--') // is 'abc'

Sometimes we want to remove characters from the ends of strings. Below, we run a radio station and get ad scripts from our partner. Unfortunately they are poorly formatted, so let's clean up what we can.

Try It

const adScript = `The Avett Brothers are playing tonight!
 Come see them  \n\n  \tlive at Red Rocks. \n\n\n\n  \tThe first caller who
 names the lead singer's debut\t \n\n solo album gets 2 free tickets.`

const pruneWhitespace = prune([' ', '\t'])
const removeStrayNewlines = replaceAllMatches('\n', '')

const format = compose([
  split('\n\n'),
  mapValues(removeStrayNewlines),
  mapValues(pruneWhitespace),
  joinValues('\n'),
])

const formattedScript = format(adScript)
console.log(formattedScript)
// prints
// The Avett Brothers are playing tonight! Come see them
// live at Red Rocks.
//
// The first caller who names the lead singer's debut
// solo album gets 2 free tickets.
const adScript = `The Avett Brothers are playing tonight!
 Come see them  \n\n  \tlive at Red Rocks. \n\n\n\n  \tThe first caller who
 names the lead singer's debut\t \n\n solo album gets 2 free tickets.`

const pruneWhitespace = prune([' ', '\t'])
const removeStrayNewlines = replaceAllMatches('\n', '')

const format = compose([
  split('\n\n'),
  mapValues(removeStrayNewlines),
  mapValues(pruneWhitespace),
  joinValues('\n'),
])

const formattedScript = format(adScript)
console.log(formattedScript)
// prints
// The Avett Brothers are playing tonight! Come see them
// live at Red Rocks.
//
// The first caller who names the lead singer's debut
// solo album gets 2 free tickets.

Try It

const adScript = `The Avett Brothers are playing tonight!
 Come see them  \n\n  \tlive at Red Rocks. \n\n\n\n  \tThe first caller who
 names the lead singer's debut\t \n\n solo album gets 2 free tickets.`

const pruneWhitespace = prune([' ', '\t'])
const removeStrayNewlines = replaceAllMatches(
  '\n',
  ''
)

const format = compose([
  split('\n\n'),
  mapValues(removeStrayNewlines),
  mapValues(pruneWhitespace),
  joinValues('\n'),
])

const formattedScript = format(adScript)
console.log(formattedScript)
// prints
// The Avett Brothers are playing tonight! Come see them
// live at Red Rocks.
//
// The first caller who names the lead singer's debut
// solo album gets 2 free tickets.
const adScript = `The Avett Brothers are playing tonight!
 Come see them  \n\n  \tlive at Red Rocks. \n\n\n\n  \tThe first caller who
 names the lead singer's debut\t \n\n solo album gets 2 free tickets.`

const pruneWhitespace = prune([' ', '\t'])
const removeStrayNewlines = replaceAllMatches(
  '\n',
  ''
)

const format = compose([
  split('\n\n'),
  mapValues(removeStrayNewlines),
  mapValues(pruneWhitespace),
  joinValues('\n'),
])

const formattedScript = format(adScript)
console.log(formattedScript)
// prints
// The Avett Brothers are playing tonight! Come see them
// live at Red Rocks.
//
// The first caller who names the lead singer's debut
// solo album gets 2 free tickets.