Add matches, matchesWith

snippets/matches.md

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+### matches
+
+Compares two objects to determine if the first one contains equivalent property values to the second one.
+
+Use `Object.keys(source)` to get all the keys of the second object, then `Array.every()`, `Object.hasOwnProperty()` and strict comparison to determine if all keys exist in the first object and have the same values.
+
+```js
+const matches = (obj, source) =>
+  Object.keys(source).every(
+    key => obj.hasOwnProperty(key) && obj[key] === source[key]
+  );
+```
+
+```js
+matches({ age: 25, hair: 'long', beard: true }, { hair: 'long', beard: true }) // true
+matches({ hair: 'long', beard: true }, { age: 25, hair: 'long', beard: true }) // false
+```

snippets/matchesWith.md

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+### matchesWith
+
+Compares two objects to determine if the first one contains equivalent property values to the second one, based on a provided function.
+
+Use `Object.keys(source)` to get all the keys of the second object, then `Array.every()`, `Object.hasOwnProperty()` and the provided function to determine if all keys exist in the first object and have equivalent values.
+If no function is provided, the values will be compared using the equality operator.
+
+```js
+const matchesWith = (obj, source, fn) =>
+  Object.keys(source).every(
+    key =>
+      obj.hasOwnProperty(key) && fn
+        ? fn(obj[key], source[key], key, obj, source)
+        : obj[key] == source[key]
+  );
+```
+
+```js
+const isGreeting = val => /^h(?:i|ello)$/.test(val);
+matchesWith({ greeting: 'hello' }, { greeting: 'hi' }, (oV, sV) => isGreeting(oV) && isGreeting(sV)); // true
+```