33 lines
1.0 KiB
Markdown
33 lines
1.0 KiB
Markdown
---
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title: Matches object properties based on function
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type: snippet
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language: javascript
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tags: [object]
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cover: watermelon-bike
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dateModified: 2020-10-21T21:54:53+03:00
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---
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Compares two objects to determine if the first one contains equivalent property values to the second one, based on a provided function.
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- Use `Object.keys()` to get all the keys of the second object.
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- Use `Array.prototype.every()`, `Object.prototype.hasOwnProperty()` and the provided function to determine if all keys exist in the first object and have equivalent values.
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- If no function is provided, the values will be compared using the equality operator.
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```js
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const matchesWith = (obj, source, fn) =>
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Object.keys(source).every(key =>
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obj.hasOwnProperty(key) && fn
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? fn(obj[key], source[key], key, obj, source)
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: obj[key] == source[key]
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);
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```
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```js
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const isGreeting = val => /^h(?:i|ello)$/.test(val);
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matchesWith(
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{ greeting: 'hello' },
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{ greeting: 'hi' },
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(oV, sV) => isGreeting(oV) && isGreeting(sV)
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); // true
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```
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