Question: I hava a list of sings: 

```
var sings = [",",".",":","!","?"]

```

How do I check if a word contains one of these signs and return it?

For example:

```
"But,"

return ","

"Finished."

return "."

"Questions?"

return "?"

```

Answer: 
Here is example function

```
var checkSigns = function(str) {
    var signs = [",",".",":","!","?"];

    for (var i = 0; i < signs.length; i++) {
        if (str.indexOf[signs[i]] !== -1) {
            return signs[i];
        }
    }
};

```
Try this prototype `str.hasSign();` return `sign` if contains or `false` if not.

```js
String.prototype.hasSigns = function() {
  var signs = [",", ".", ":", "!", "?"];
  for (var i = 0; i < signs.length; i++) {
    if (this.indexOf(signs[i]) > -1) return signs[i];
  }
  return false;
}

console.log("football, basketball".hasSigns());

console.log("1-3".hasSigns());

console.log("Good!".hasSigns());
```