# Coding/Blog challenge 7

This problem wasn't too hard for me, but I knew it would be easier if I learned some more RegEx. So, I took some time to watch some tutorials and to check out  [RegExr](https://regexr.com/). I am glad that I decided to do this because the other way I thought of would be many more lines of code.

### The Question
Yet another  [CodeWars](https://www.codewars.com/dashboard) challenge here. 

![JsProblem7.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1623892548627/jm-DLPbAc.png)

Immediately, I think how I could use the Array  [split](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split) method to split each word at the whitespace into an array where I can run a loop over each word to inspect it. 
I also set a variable with the regex I want to use. The regex expression "/[a-z|A-Z]/g" will return a number that will be included in the text of each word. It searches for a character from a to z in both lower case and uppercase letters & we do this globally to remove ALL the characters from a to z. Since there is only one number, 0-9 in each word, we don't need to worry about multiple numbers in each word.
```
//define our function
function order(words) {
    // set variable to regex
    numRegex = /[a-z|A-Z]/g;
    // split our words into singular words in an array
    words = words.split(' ');
}
```
After this, I decided to create a container array to hold my ordered words. I then use a higher order array object method  [forEach](https://www.w3schools.com/jsref/jsref_foreach.asp). For every word I have, I decide to replace the letter characters with an empty string, which leaves only the number. I set this to a variable for readability.
Finally, we use this new variable to set where it should go in the container array. We also need to subtract by 1 since arrays start at 0 index, and we will never have a zero inserted into a word for this problem. 
Then we return our container array and use the  [join
](https://www.w3schools.com/jsref/jsref_join.asp) method to put the array back together as a string, adding the spaces.
```
function order(words) {
    numRegex = /[a-z|A-Z]/g;
    words = words.split(' ');
    //we create container array
    newWords = [];
    //and loop through all words
    words.forEach(word => {
        //now set index to the number contained within each word
        index = Number(word.replace(numRegex, ""))
        //then assign where the word should be according to its number
        newWords[index - 1] = word
    });
    //join container array together with spaces between words
    return newWords.join(" ");
}
``` 
BLAMO!

### Hindsight
There is a lot more to learn for me with regex & I love looking at other solutions to the same problem because it gives me great ideas. Here's a clever solution I saw to this same problem.
 
```
var reg = /\d/;
function order(words){
  return words.split(' ').sort(comparator).join(' ');
}
function comparator(word, nextWord) {
  return +word.match(reg) - +nextWord.match(reg)
}
```
That's all folks!