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js string hashcode

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Mysterious Manx answered on July 28, 2021 Popularity 7/10 Helpfulness 4/10

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A copy of Java's string hashcode method for js

/**
 * Returns a hash code from a string
 * @param  {String} str The string to hash.
 * @return {Number}    A 32bit integer
 * @see http://werxltd.com/wp/2010/05/13/javascript-implementation-of-javas-string-hashcode-method/
 */
function hashCode(str) {
    let hash = 0;
    for (let i = 0, len = str.length; i < len; i++) {
        let chr = str.charCodeAt(i);
        hash = (hash << 5) - hash + chr;
        hash |= 0; // Convert to 32bit integer
    }
    return hash;
}

Popularity 7/10 Helpfulness 4/10 Language javascript

Source: stackoverflow.com

Tags: hashcode javascript string

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Contributed on May 08 2023

Mysterious Manx

0 Answers Avg Quality 2/10

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js hashcode string

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/**
 * @see http://stackoverflow.com/q/7616461/940217
 * @return {number}
 */
String.prototype.hashCode = function(){
    if (Array.prototype.reduce){
        return this.split("").reduce(function(a,b){a=((a<<5)-a)+b.charCodeAt(0);return a&a},0);              
    } 
    var hash = 0;
    if (this.length === 0) return hash;
    for (var i = 0; i < this.length; i++) {
        var character  = this.charCodeAt(i);
        hash  = ((hash<<5)-hash)+character;
        hash = hash & hash; // Convert to 32bit integer
    }
    return hash;
}

Popularity 8/10 Helpfulness 7/10 Language javascript

Source: stackoverflow.com

Tags: hashcode javascript

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Contributed on Feb 10 2023

Tiago F2

0 Answers Avg Quality 2/10

javascript hash string

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-1

function hashCode(str) {
  return str.split('').reduce((prevHash, currVal) =>
    (((prevHash << 5) - prevHash) + currVal.charCodeAt(0))|0, 0);
}

// Test
console.log("hashCode(\"Hello!\"): ", hashCode('Hello!'));

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: hash

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Contributed on Jul 28 2021

Fantastic Frog

0 Answers Avg Quality 2/10

javascript hashcode

Comment

-1

function hashCode(s) {
    for(var i = 0, h = 0; i < s.length; i++)
        h = Math.imul(31, h) + s.charCodeAt(i) | 0;
    return h;
}
hashCode(""); // 0
hashCode("js"); // 3401

Popularity 6/10 Helpfulness 1/10 Language javascript

Source: gist.github.com

Tags: hashcode javascript

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Contributed on Dec 21 2022

Marwan Zayed

0 Answers Avg Quality 2/10

js string hashcode

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