This is the rest of the question, or question number two.
Windows property sheet hash calculator how to#
Windows property sheet hash calculator windows 10#
This is the caption of the original question.ĭefault email app in Windows 10 is an App which handles mailto: protocol. Where Windows 10 stores default email app in its registry?.The following is an angularjs service and it supports numbers, strings, and objects. I combined the answers from eyelidlessness and KimKha. Relationship between hashCode and equals method in Java.In addition to that it is great to have: "hashcode equal if objects are equal" In practice you need two things: enough uniqueness, enough speed So even if JavaScript/ECMAScript adds more support, there is no magic language solution for this problem. There is no magically efficient hashing technique for unknown data, in some cases it is quite easy, in other cases you may have to think twice. you could serialize to string and hash it Java style, but that may be expensive if the string is large and it will not avoid collisions as well as say the hash of an integer (self). see how Java does it: Good Hash Function for Strings, or use some other ID info that is cheap and unique enough for your usecase For example with a person object, you may compute a hash using firstname, lastname, birthdate.Your data has some natural "composite" uniqueness: This will respect: hashcode equal if objects are equal.Anything which is indirectly pretty much a unique integer is the simplest case.it depends on the string, if the string represents a unique identifier, you may consider it as a hash (so no hashing needed). the integer, as it is unique, lucky you ! Your data has some natural "simple" uniqueness: It depends on what data you have and what you want to achieve. When we talk about hashing in JavaScript or Java most of the time we are talking about non-cryptographic hashing, usually about hashing for hashmap/hashtable (unless we are working on authentication or passwords, which you could be doing server-side using NodeJS. The other problem, is you have to understand why hashing is useful and how it works. there is cryptographic hashing and non-cryptographic hashing. One problem is with the term hash/hashcode.
For example Java has good hashing support, but you still have to think and do some work. I will try to go a little deeper than other answers.Įven if JS had better hashing support it would not magically hash everything perfectly, in many cases you will have to define your own hash function. You might also be interested by this similar method to generate HMAC codes via the web crypto api.
However, for a simple FAST checksum hash function, made only for collision avoidance, see CRC32 (Content Redundancy Check) Supported algos: SHA-1 (but don't use this in cryptographic applications) They're also supported in Node v7, and in v6 with the -harmony-weak-maps flag.Ĭonst msgUint8 = new TextEncoder().encode(m)Ĭonst hashBuffer = await ('SHA-256', msgUint8)Ĭonst hashArray = om(new Uint8Array(hashBuffer))Ĭonst hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('') WeakMaps are available in current Firefox, Chrome and Edge. Wm2.has(o3) // True (even if the value itself is 'undefined'). Wm2.get(o3) // Undefined, because that is the set value. Wm2.get(o2) // Undefined, because there is no value for o2 on wm2. Wm2.set(wm1, wm2) // Keys and values can be any objects. Wm2.set(o1, o2) // A value can be anything, including an object or a function. It's important for a bunch of engine implementation reasons relating to efficiency and garbage collection, but it's also super cool for in that it allows for new semantics like revokable access permissions and passing data without exposing the data sender. This means it's impossible to get a reference to a value unless you have a direct reference to the key (any object!) that links to it. That is: a set where the keys can be anything (including undefined) and is non-enumerable.
What you described is covered by Harmony WeakMaps, part of the ECMAScript 6 specification (next version of JavaScript).
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