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Returns a new Array containing zero or more leading elements of self; does not modify self.
With a block given, calls the block with each successive element of self; stops if the block returns false or nil; returns a new Array containing those elements for which the block returned a truthy value:
a = [0, 1, 2, 3, 4, 5]
a.take_while {|element| element < 3 } # => [0, 1, 2]
a.take_while {|element| true } # => [0, 1, 2, 3, 4, 5]
a # => [0, 1, 2, 3, 4, 5]
With no block given, returns a new Enumerator:
[0, 1].take_while # => #<Enumerator: [0, 1]:take_while>
 
               static VALUE
rb_ary_take_while(VALUE ary)
{
    long i;

    RETURN_ENUMERATOR(ary, 0, 0);
    for (i = 0; i < RARRAY_LEN(ary); i++) {
        if (!RTEST(rb_yield(RARRAY_AREF(ary, i)))) break;
    }
    return rb_ary_take(ary, LONG2FIX(i));
}
            

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