remove -- remove an entry from a mutable hash table, list, or database

Synopsis

• Usage:

  remove(T, k)

• Inputs:
  • T, a hash table, a mutable list, or a database,
  • k, the key to remove (must be an integer if T is a mutable list or a string if it is a database)
• Outputs:

Description

i1 : T = new MutableHashTable from {a => 1, b => 2, c => 3}; peek T

o2 = MutableHashTable{a => 1}
                      b => 2
                      c => 3

i3 : remove(T, a)

i4 : peek T

o4 = MutableHashTable{b => 2}
                      c => 3

i5 : T = new HashTable from {a => 1, b => 2, c => 3}

o5 = HashTable{a => 1}
               b => 2
               c => 3

o5 : HashTable

i6 : T = applyPairs(T, (k, v) -> if k =!= a then (k, v))

o6 = HashTable{b => 2}
               c => 3

o6 : HashTable

i7 : T = new MutableList from {1, 2, 3, 4}; peek T

o8 = MutableList{1, 2, 3, 4}

i9 : remove(T, 0)

i10 : peek T

o10 = MutableList{2, 3, 4}

i11 : remove(T, -1)

i12 : peek T

o12 = MutableList{2, 3}

See also

• applyKeys -- apply a function to each key in a hash table
• applyPairs -- apply a function to each pair in a hash table
• applyValues -- apply a function to each value in a hash table
• delete -- delete some elements of a list
• drop -- drop some elements from a list or sequence.
• keys -- keys used in a hash table, dictionary, or database
• isMutable -- whether something may be modified
• scanKeys -- apply a function to each key in a hash table or database
• hash tables