Groovy: list: Count number of occurrences of given value

Groovy provides count method that takes a value as an argument and return number of occurrences of this value.

public Number count(Object value)

Counts the number of occurrences of the given value inside this Iterable. It compares the values using == operator.

HelloWorld.groovy

numbers = [1, 3, 3, 3, 2, 1, 4, 5, 4, 3, 2, 1, 6, 7, 8]

repeated = numbers.count(3)
println "3 repeated $repeated times in $numbers"

repeated = numbers.count(1)
println "1 repeated $repeated times in $numbers"

repeated = numbers.count(10)
println "10 repeated $repeated times in $numbers"

Output

3 repeated 4 times in [1, 3, 3, 3, 2, 1, 4, 5, 4, 3, 2, 1, 6, 7, 8]

1 repeated 3 times in [1, 3, 3, 3, 2, 1, 4, 5, 4, 3, 2, 1, 6, 7, 8]

10 repeated 0 times in [1, 3, 3, 3, 2, 1, 4, 5, 4, 3, 2, 1, 6, 7, 8]

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