concat(p1)
public
Append—Concatenates the given object to str. If the object is a
Integer, it is considered as a codepoint, and
is converted to a character before concatenation.
a = "hello "
a << "world"
a.concat(33)
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VALUE
rb_str_concat(VALUE str1, VALUE str2)
{
if (FIXNUM_P(str2) || TYPE(str2) == T_BIGNUM) {
rb_encoding *enc = STR_ENC_GET(str1);
unsigned int c = NUM2UINT(str2);
int pos = RSTRING_LEN(str1);
int len = rb_enc_codelen(c, enc);
int cr = ENC_CODERANGE(str1);
rb_str_resize(str1, pos+len);
rb_enc_mbcput(c, RSTRING_PTR(str1)+pos, enc);
ENC_CODERANGE_SET(str1, cr);
return str1;
}
return rb_str_append(str1, str2);
}