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Memory efficient replace functions


Memory efficient replace functions

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Memory efficient replace functions
Tag : java , By : user183345
Date : November 24 2020, 03:01 PM

it helps some times This answer is addressing the issue when working with a general string. There are better solutions if you're working with HTML.
data = data.substring(1, data.length() - 1);
data = StringUtils.replace(data, "\\u003C", "<");
data = StringUtils.replace(data, "\\u003E", ">");
data = StringUtils.replace(data, "\\\"", "\"");
StringBuilder sb = new StringBuilder(data.length());
Map<String, String> replacements = Map.of("\\u003C", "<", "\\u003E", ">" /* etc */);
for (int i = 1; i < data.length() - 1; ++i) {
  sb.append(data.charAt(i));

  for (Map.Entry<String, String> entry : replacements.entrySet()) {
    String search = entry.getKey();

    // This is basically checking "endsWith".
    int endIndex = sb.length() - search.length();
    if (endIndex >= 0 && sb.indexOf(search, endIndex) == endIndex) {
      sb.delete(endIndex, sb.length());
      sb.append(entry.getValue());
    }
   }
}
data = sb.toString();
Pattern p = Pattern.compile(
    replacements.keySet()
        .stream()
        .map(Pattern::quote)
        .collect(Collectors.joining("|")));
Matcher m = p.matcher(data);
int prev = 1;
while (m.find()) {
  sb.append(data, prev, m.start());
  sb.append(replacements.get(m.group()));
  prev = m.end();
}
sb.append(data, prev, data.length() - 1);
if (!m.group().startsWith("<head>")) {
  sb.append(replacements.get(m.group()));
}

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Which is more efficient memory wise: static functions, or functions of an object that is deleted right away?


Tag : cpp , By : user98986
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , As it stands, none of this makes any sense. The real solution would be to provide a free function (a function at namespace scope), because this is what free functions are there for.
Oh, and since you asked: If calling this one single function has noticeable overhead in your code, then you will only find out about it through careful profiling. Profiling is also what would answer your question which way is faster.

What's the most memory/processor efficient way to pass structs as parameters to functions for modification?


Tag : development , By : pcoramc
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further In Go, using pointers to pass structs for modification is the idiomatic way to do it. There are no reference variables as there are in other languages. So passing a pointer is the most efficient way to do it now and since it is idiomatic, will most likely be so in future versions of Go as well.

Writing efficient functions for data.tables that replace by reference


Tag : r , By : user134570
Date : March 29 2020, 07:55 AM
To fix the issue you can do This is similar to Frank's but lets the arguments be passed to a function that builds the translation vector and returns the translation. You don't need to do the loop inside the function since the lapply , the :=, and the .SDcols functions are doing the looping inside [.data.table.
recode_dt <- function(datacol, oldval, newval) 
    { trans <- setNames(newval, oldval)
     trans[ datacol ]   }

dt[, (bincols) := lapply(.SD, recode_dt, oldval = c("u", "n", "y"), 
                                         newval = c(NA_real_, 0, 1)), 
     .SDcols = bincols]
dt
#===============
   id     fruit     mydate eaten present sex
1:  1     apple 2015-09-01     1       0   m
2:  2    orange 2015-09-02     1       0   f
3:  3    banana 2015-11-15     0       1   f
4:  4 strawbery 2016-02-24     1       1   m
5:  5  rasberry 2016-03-08    NA       1   f

Memory efficient way to replace string in Java


Tag : java , By : user118656
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further There are couple of solutions other than thinking about java string pool maintenance. Since based on expert comments we can't do much about it. Architectural guidance has always been to avoid excessive processing on data by use of proper modelling.
I don't think an improvement is viable in Java, but if I get this problem, I will try the following:

What is Memory efficient way to replace some pattern of string to other


Tag : java , By : Mr. Tacos
Date : March 29 2020, 07:55 AM
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