String#+@

() -> self

+string → new_string or self

static VALUE
str_uplus(VALUE str)
{
    if (OBJ_FROZEN(str) || CHILLED_STRING_P(str)) {
        return rb_str_dup(str);
    }
    else {
        return str;
    }
}

Returns self if self is not frozen and can be mutated without warning issuance.

Otherwise returns self.dup, which is not frozen.

See also #+ #-@ #* #<< also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0

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