djb2 Hash Function

djb2 Hash Function

By : nikJ
Date : November 21 2020, 07:01 PM
Does that help Hash calculations often overflow. That's generally not a problem at all, so long as you have guarantees about what's going to happen when it does overflow. Don't forget that the point of a hash isn't to have a number which means something in terms of magniture etc - it's just a way of detecting equality. Why would overflow interfere with that?
code :

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Does hash function djb2 have java version?

Does hash function djb2 have java version?

By : KunsellesnuK
Date : March 29 2020, 07:55 AM
like below fixes the issue Are you going to be interoperating with languages featuring unsigned types? If not you can probably just use the standard java long without a problem. It will probably overflow anyways (as per the discussion here djb2 Hash Function) but that's not a problem.
Here's a PermissionSet class in the wild using this implementation. Don't forget that a hashCode in Java needs to return an integer anyways, so the lack of an unsigned long should not make a difference - there will just be fewer possible values that the function takes on.
djb2 by Dan Bernstein for c++

djb2 by Dan Bernstein for c++

By : He Qiang
Date : March 29 2020, 07:55 AM
To fix the issue you can do You want s[i], not s[i++]. Even better would be to use range-based for.
code :
int hf(std::string const& s) {
    unsigned long hash = 5381;
    for (auto c : s) {
        hash = (hash << 5) + hash + c; /* hash * 33 + c */
    return hash;
what is possibility of collision in djb2 function?

what is possibility of collision in djb2 function?

By : user3857956
Date : March 29 2020, 07:55 AM
seems to work fine I got the solution after modifying the above code.
String.prototype.hashCode = function(){ var hash = 5381; if (this.length === 0) return hash; for (var i = 0; i < this.length; i++) { var character = this.charCodeAt(i);
Passing a "String" Object into a DJB2 hash function

Passing a "String" Object into a DJB2 hash function

By : Taavi
Date : March 29 2020, 07:55 AM
may help you . I was using the standard char * version of the djb2 hash function: , Use a string instead?
code :
unsigned long DJB2(std::string str){
    unsigned long hash = 5381;
    int c;

    for (int i = 0; i < str.length(); ++i) {
        c = (int) str[i];
        hash = ((hash << 5) + hash) + c; 
    return hash;
Hash string function djb2 avoiding collisions properly?

Hash string function djb2 avoiding collisions properly?

By : Rohan Practice
Date : March 29 2020, 07:55 AM
With these it helps I am studying about hash string functions for a hasmap in javascript. And looking into this code that I found in the web, I am not sure if the function is correct or not: ,
Does it make any sense to have this line?
code :
   hash = hash & hash;
 hash = hash & 0xFFFFFFFF
return hash ^ string.length ^ this._secret;
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