reloacated truthy to be a part of JavaScript premier

Author: basarat

SUMMARY.md

@@ -9,6 +9,7 @@
  * [this](docs/javascript/this.md)
  * [Closure](docs/javascript/closure.md)
  * [Number](docs/javascript/number.md)
+ * [Truthy](docs/tips/truthy.md)
 * [Future JavaScript Now](docs/future-javascript.md)
  * [Classes](docs/classes.md)
  * [Classes Emit](docs/classes-emit.md)
@@ -93,7 +94,6 @@
  * [static constructors](docs/tips/staticConstructor.md)
  * [singleton pattern](docs/tips/singleton.md)
  * [Function parameters](docs/tips/functionParameters.md)
- * [Truthy](docs/tips/truthy.md)
  * [Build Toggles](docs/tips/build-toggles.md)
  * [Barrel](docs/tips/barrel.md)
  * [Create Arrays](docs/tips/create-arrays.md)

docs/tips/truthy.md renamed to docs/javascript/truthy.md

@@ -30,7 +30,7 @@ Quite commonly it helps to be explicit that the intent is to treat the value as
 
 It is common to use this pattern in lots of places e.g.
 
-```ts
+```js
 // Direct variables
 const hasName = !!name;
 
@@ -39,6 +39,6 @@ const someObj = {
  hasName: !!name
 }
 
-// e.g. ReactJS
+// e.g. in ReactJS JSX
 {!!someName && <div>{someName}</div>}
 ```