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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,23 @@ | ||
/** | ||
* Returns a hash code for a string. | ||
* (Compatible to Java's String.hashCode()) | ||
* | ||
* The hash code for a string object is computed as | ||
* s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1] | ||
* using number arithmetic, where s[i] is the i th character | ||
* of the given string, n is the length of the string, | ||
* and ^ indicates exponentiation. | ||
* (The hash value of the empty string is zero.) | ||
* | ||
* Do not use in a security critical context. | ||
* | ||
* @see https://gist.github.com/hyamamoto/fd435505d29ebfa3d9716fd2be8d42f0 | ||
*/ | ||
export default function insecureHash(str: string) { | ||
let h = 0; | ||
for (let i = 0; i < str.length; i += 1) { | ||
// eslint-disable-next-line no-bitwise | ||
h = (Math.imul(31, h) + str.charCodeAt(i)) | 0; | ||
} | ||
return h; | ||
} |
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