End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
Range#each
rng.each {| i | block } → rng
rng.each → an_enumerator
range.c
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static VALUE
range_each(VALUE range)
{
VALUE beg, end;
long i;
RETURN_SIZED_ENUMERATOR(range, 0, 0, range_enum_size);
beg = RANGE_BEG(range);
end = RANGE_END(range);
if (FIXNUM_P(beg) && NIL_P(end)) {
range_each_fixnum_endless(beg);
}
else if (FIXNUM_P(beg) && FIXNUM_P(end)) { /* fixnums are special */
return range_each_fixnum_loop(beg, end, range);
}
else if (RB_INTEGER_TYPE_P(beg) && (NIL_P(end) || RB_INTEGER_TYPE_P(end))) {
if (SPECIAL_CONST_P(end) || RBIGNUM_POSITIVE_P(end)) { /* end >= FIXNUM_MIN */
if (!FIXNUM_P(beg)) {
if (RBIGNUM_NEGATIVE_P(beg)) {
do {
rb_yield(beg);
} while (!FIXNUM_P(beg = rb_big_plus(beg, INT2FIX(1))));
if (NIL_P(end)) range_each_fixnum_endless(beg);
if (FIXNUM_P(end)) return range_each_fixnum_loop(beg, end, range);
}
else {
if (NIL_P(end)) range_each_bignum_endless(beg);
if (FIXNUM_P(end)) return range;
}
}
if (FIXNUM_P(beg)) {
i = FIX2LONG(beg);
do {
rb_yield(LONG2FIX(i));
} while (POSFIXABLE(++i));
beg = LONG2NUM(i);
}
ASSUME(!FIXNUM_P(beg));
ASSUME(!SPECIAL_CONST_P(end));
}
if (!FIXNUM_P(beg) && RBIGNUM_SIGN(beg) == RBIGNUM_SIGN(end)) {
if (EXCL(range)) {
while (rb_big_cmp(beg, end) == INT2FIX(-1)) {
rb_yield(beg);
beg = rb_big_plus(beg, INT2FIX(1));
}
}
else {
VALUE c;
while ((c = rb_big_cmp(beg, end)) != INT2FIX(1)) {
rb_yield(beg);
if (c == INT2FIX(0)) break;
beg = rb_big_plus(beg, INT2FIX(1));
}
}
}
}
else if (SYMBOL_P(beg) && (NIL_P(end) || SYMBOL_P(end))) { /* symbols are special */
beg = rb_sym2str(beg);
if (NIL_P(end)) {
rb_str_upto_endless_each(beg, sym_each_i, 0);
}
else {
rb_str_upto_each(beg, rb_sym2str(end), EXCL(range), sym_each_i, 0);
}
}
else {
VALUE tmp = rb_check_string_type(beg);
if (!NIL_P(tmp)) {
if (!NIL_P(end)) {
rb_str_upto_each(tmp, end, EXCL(range), each_i, 0);
}
else {
rb_str_upto_endless_each(tmp, each_i, 0);
}
}
else {
if (!discrete_object_p(beg)) {
rb_raise(rb_eTypeError, "can't iterate from %s",
rb_obj_classname(beg));
}
if (!NIL_P(end))
range_each_func(range, each_i, 0);
else
for (;; beg = rb_funcallv(beg, id_succ, 0, 0))
rb_yield(beg);
}
}
return range;
}
Iterates over the elements of range, passing each in turn to the block.
The each method can only be used if the begin object of the range supports the succ method. A TypeError is raised if the object does not have succ method defined (like Float).
If no block is given, an enumerator is returned instead.
Example
(10..15).each {|n| print n, ' ' } # prints: 10 11 12 13 14 15 (2.5..5).each {|n| print n, ' ' } # raises: TypeError: can't iterate from Float