count

  • We can count the number of elements in an array in Ruby using the Array#length method.

    PHP

    $numbers = array(1, 2, 3);
print count($numbers);
// => 3

    Ruby

    numbers = [1, 2, 3]
puts numbers.length
# => 3

    An important gotcha to remember is that while we can skip elements in an array in PHP, we cannot do so in Ruby. If you add a tenth element to an array, Ruby will fill in the missing elements with nil.

    PHP

    $numbers = array(1, 2);
$numbers[10] = 3;
print count($numbers);
// => 3

    Ruby

    numbers = [1, 2]
numbers[10] = 3
puts numbers.length
# => 11

    see also

← copy count_chars →

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