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Add for...in loop to javascript-101/loops.md #552

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Add for...in loop to javascript-101/loops.md #552

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Expand Up @@ -107,6 +107,17 @@ do {

These types of loops are quite rare since only few situations require a loop that blindly executes at least once. Regardless, it's good to be aware of it.

## `for...in` loop

A `for...in` loop iterates over the properties of an object. For each property, statements can be executed.

```
for ( prop in obj ) {
// in this scope, 'prop' is set to the property name.
console.log( prop + ': ' + obj[ prop ] );
}
```

## Breaking and Continuing

Usually, a loop's termination will result from the conditional statement not evaluating to a truthy value, but it is possible to stop a loop in its tracks from within the loop's body with the `break` statement:
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