30 lines
839 B
Markdown
30 lines
839 B
Markdown
---
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title: Parse cookie
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tags: browser,string
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cover: three-vases
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firstSeen: 2018-01-13T14:19:21+02:00
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lastUpdated: 2020-10-22T20:24:04+03:00
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---
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Parses an HTTP Cookie header string, returning an object of all cookie name-value pairs.
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- Use `String.prototype.split()` to separate key-value pairs from each other.
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- Use `Array.prototype.map()` and `String.prototype.split()` to separate keys from values in each pair.
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- Use `Array.prototype.reduce()` and `decodeURIComponent()` to create an object with all key-value pairs.
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```js
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const parseCookie = str =>
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str
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.split(';')
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.map(v => v.split('='))
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.reduce((acc, v) => {
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acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());
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return acc;
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}, {});
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```
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```js
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parseCookie('foo=bar; equation=E%3Dmc%5E2');
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// { foo: 'bar', equation: 'E=mc^2' }
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```
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