#            
## Overview
When writing code, at some point you might want to replace a particular character of a string variable at once, and you may not have an idea how to do it. This shot explains how to conveniently do just that.

## Replacing a string character
To replace a character, especially an old character of a string in R, we use the `chartr()` function. 

The **`chartr()` function** in R replaces an instance of an old character with a new character in the specified string set.
## Syntax
```
chartr(old, new, x)
```
## Parameters
The `chartr()` function takes the following parameter values:
* **`old`**: This represents the old character of the specified string you wish to replace.
* **`new`**: This represents the new character.
* **`x`**: The specified string.

## Return value
The `chartr()` function returns a modified string.

## Example 1


# creating a string variable
mystring = "Hi Theo would you like to have some cookies?"

# replacing "o" with "U" using the chartr() function
chartr("o", "U", mystring)


## Explanation
* **Line 2**: We create a string variable `mystring`.
* **Line 5**: Using the `chartr()` function, we change every instance of the `o` character in the string to `U`.

Interestingly, the `chartr()` function does not apply to just a single character but also to multiple characters.
## Example 2


# creating a string variable
mystring = "Hi Theo would you like to have some cookies?"

# replacing "o" with "1", "u"  with "2" and "e" with "3" 
chartr("oue", "123", mystring)

## Explanation 
**Line 5**: We change multiple characters `o`, `u`, and `e` to `1`, `2` and `3` respectively at any of their instances in the string `mystring`.

How to replace an instance of an old character of a string in R

Use the chartr() function in R to replace specific old characters with new ones in a string.