diff --git a/snippets/hashBrowser.md b/snippets/hashBrowser.md index 5a5acad9c..83e56ea12 100644 --- a/snippets/hashBrowser.md +++ b/snippets/hashBrowser.md @@ -1,11 +1,16 @@ --- title: hashBrowser -tags: browser,advanced,promise,advanced +tags: browser,promise,advanced --- -Creates a hash for a value using the [SHA-256](https://en.wikipedia.org/wiki/SHA-2) algorithm. Returns a promise. +Creates a hash for a value using the [SHA-256](https://en.wikipedia.org/wiki/SHA-2) algorithm. +Returns a promise. - Use the [SubtleCrypto](https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto) API to create a hash for the given value. +- Create a new `TextEncoder` and use it to encode `val`, passing its value to `SubtleCrypto.digest()` to generate a digest of the given data. +- Use `DataView.prototype.getUint32()` to read data from the resolved `ArrayBuffer`. +- Add the data to an array using `Array.prototype.push()` after converting it to its hexadecimal representation using `Number.toString(16)`. +- Finally, use `Array.prototype.join()` to combine values in the array of `hexes` into a string. ```js const hashBrowser = val => @@ -19,5 +24,8 @@ const hashBrowser = val => ``` ```js -hashBrowser(JSON.stringify({ a: 'a', b: [1, 2, 3, 4], foo: { c: 'bar' } })).then(console.log); // '04aa106279f5977f59f9067fa9712afc4aedc6f5862a8defc34552d8c7206393' +hashBrowser( + JSON.stringify({ a: 'a', b: [1, 2, 3, 4], foo: { c: 'bar' } }) +).then(console.log); +// '04aa106279f5977f59f9067fa9712afc4aedc6f5862a8defc34552d8c7206393' ```