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11 changes: 11 additions & 0 deletions 05_Day_Arrays/05_day_arrays.md
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Expand Up @@ -42,6 +42,7 @@
- [Add an element from the beginning](#add-an-element-from-the-beginning)
- [Reversing array order](#reversing-array-order)
- [Sorting elements in array](#sorting-elements-in-array)
- [Converting Arrays to Strings](#converting-arrays-to-string)
- [Array of arrays](#array-of-arrays)
- [💻 Exercise](#-exercise)
- [Exercise: Level 1](#exercise-level-1)
Expand Down Expand Up @@ -653,6 +654,16 @@ console.log(arrayOfArray[0]) // [1, 2, 3]
console.log(fullStack[1]) // ["Node", "Express", "MongoDB"]
```

### Converting Arrays to String

The join() method allows you to concatenate all elements of an array and returns a new string:
```js
const frontEnd = ['HTML', 'CSS', 'JS'];
const btnClass = cssClasses.join(' ');

console.log(btnClass); //HTML CSS JS
```

🌕 You are diligent and you have already achieved quite a lot. You have just completed day 5 challenges and you are 5 steps a head in to your way to greatness. Now do some exercises for your brain and for your muscle.

## 💻 Exercise
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