Merge pull request #310 from casaper/feat/typescript-examples

feat(typescript-examples): _.pull

README.md

@@ -1054,21 +1054,33 @@ Removes all provided values from the given array using strict equality for compa
 
   ```js
   // Lodash
-  var array = [1, 2, 3, 1, 2, 3];
+  const array = [1, 2, 3, 1, 2, 3];
   _.pull(array, 2, 3);
-  console.log(array)
-  // output: [1, 1]
+  console.log(array); // output: [1, 1]
+  ```
 
-  // Native
-  var array = [1, 2, 3, 1, 2, 3];
+  ```js
+  // Native JS
+  const array = [1, 2, 3, 1, 2, 3];
   function pull(arr, ...removeList){
       var removeSet = new Set(removeList)
       return arr.filter(function(el){
           return !removeSet.has(el)
       })
   }
-  console.log(pull(array, 2, 3))
-  // output: [1, 1]
+  console.log(pull(array, 2, 3)); // output: [1, 1]
+  console.log(array); // still [1, 2, 3, 1, 2, 3]. This is not in place, unlike lodash!
+  ```
+
+  ```ts
+  // TypeScript
+  const array = [1, 2, 3, 1, 2, 3];
+  const pull = <T extends unknown>(sourceArray: T[], ...removeList: T[]): T[] => {
+    const removeSet = new Set(removeList);
+    return sourceArray.filter(el => !removeSet.has(el));
+  };
+  console.log(pull(array, 2, 3)); // output: [1, 1]
+  console.log(array); // still [1, 2, 3, 1, 2, 3]. This is not in place, unlike lodash!
   ```
 
 #### Browser Support for `Array.prototype.filter()`