Cases

Cases(list, pattern)

returns the elements of list that match pattern.

Cases(list, pattern, ls)

returns the elements matching at levelspec ls.

Cases(list, pattern, Heads->True)

match including the head of the expression in the search.

Examples

>> Cases({a, 1, 2.5, "string"}, _Integer|_Real)
{1,2.5}

>> Cases(_Complex)[{1, 2I, 3, 4-I, 5}]
{I*2,4-I}

>> Cases(1, 2)
{}

>> Cases(f(1, 2), 2)
{2}

>> Cases(f(f(1, 2), f(2)), 2)
{}

>> Cases(f(f(1, 2), f(2)), 2, 2)
{2,2}

>> Cases(f(f(1, 2), f(2), 2), 2, Infinity)
{2,2,2}

>> Cases({1, f(2), f(3, 3, 3), 4, f(5, 5)}, f(x__) :> Plus(x))
{2,9,10}

>> Cases({1, f(2), f(3, 3, 3), 4, f(5, 5)}, f(x__) -> Plus(x))
{2, 3, 3, 3, 5, 5}

Related terms

Pick, Select

Implementation status

• ✅ - full supported

Github

• Implementation of Cases