Method: String#upcase

Defined in:
string.c

#upcase ⇒ String

Returns a copy of str with all lowercase letters replaced with their uppercase counterparts. The operation is locale insensitive—only characters “a” to “z” are affected. Note: case replacement is effective only in ASCII region.

"hEllO".upcase   #=> "HELLO"

Returns:



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# File 'string.c', line 5272

static VALUE
rb_str_upcase(VALUE str)
{
    str = rb_str_dup(str);
    rb_str_upcase_bang(str);
    return str;
}