27 lines
916 B
Markdown
27 lines
916 B
Markdown
---
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title: matchesWith
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tags: object,type,function,intermediate
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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(source)` to get all the keys of the second object, then `Array.prototype.every()`, `Object.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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``` |