[ADD : isArrayLike.md and isValidJSON.md]

snippets/isArrayLike.md

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+### isArrayLike
+
+Checks if the provided argument is array-like (i.e. is iterable).
+
+Use `Array.from()` and a `try... catch` block to check if the provided argument is array-like.
+
+```js
+const isArrayLike = arr => {
+  try{
+    Array.from(arr);
+    return true;
+  }
+  catch(e){
+    return false;
+  }
+}
+```
+
+```js
+isArrayLike(document.querySelector('.className')) // true
+isArrayLike('abc') // true
+isArrayLike(null) // false
+```

snippets/isValidJSON.md

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+### isValidJSON
+
+Checks if the provided argument is a valid JSON.
+
+Use `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON.
+
+```js
+const isValidJSON = obj => {
+  try{
+    JSON.parse(obj);
+    return true;
+  }
+  catch(e){
+    return false;
+  }
+}
+```
+
+```js
+isValidJSON('{"name":"Adam","age":20}'); // true
+isValidJSON('{"name":"Adam",age:"20"}'); // false
+```