Array#include?

(Elem object) -> bool

include?(object) → true or false

VALUE
rb_ary_includes(VALUE ary, VALUE item)
{
    long i;
    VALUE e;

    for (i=0; i<RARRAY_LEN(ary); i++) {
        e = RARRAY_AREF(ary, i);
        if (rb_equal(e, item)) {
            return Qtrue;
        }
    }
    return Qfalse;
}

Returns whether for some element element in self, object == element:

Example

[0, 1, 2].include?(2)   # => true
[0, 1, 2].include?(2.0) # => true
[0, 1, 2].include?(2.1) # => false

Related: see Methods for Querying.

See also #hash #index #freeze #initialize_copy also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0

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