> For the complete documentation index, see [llms.txt](https://hyundai-robotics.gitbook.io/hi6-robot-language/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hyundai-robotics.gitbook.io/hi6-robot-language/rl-english/basic-syntax/function/func-string.md).
# 2.9.2 String Functions
Examples with var str="hello, world" executed;
| Function | Description | Example of usage | Result |
| ------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------- | ------------------ |
| bin(**a**) | Returns the string of number **a** in binary representation | bin(0b0010) | "10" |
| chr(**a**) | Returns the character with **a** of the ASCII code in string type | chr(65) | "A" |
| double(**s**) | Returns the real number type value of the real number string **s** (Interpret only up to the position where interpretation is possible, and discard the rest.) | double("29.38E-2") | 0.2938 |
| hex(**a**) | Returns the string of number **a** in hexadecimal representation | hex(0x7A2F) | "7A2F" |
| int(**s**) | Returns the integer type value of the integer string **s** (Interpret only up to the position where interpretation is possible, and discard the rest.) | int("13.25")
int("29.38E-2")
| 13
29
|
| left(**s**, **n**) | Returns a string of the first **n** characters of the string **s** | left(str, 3) | "hel" |
| len(**s**) | Returns the length of the string if **s** is a string and returns the number of elements in the array if **s** is an array | len("HELLO")
len(\[20, 30, 80])
| 5
3
|
| mid(**s**, **i**, **n**) | Returns a string of **n** characters starting from the **i**-th character of the string **s** (The position of the first character is 0.) | mid(str, 3, 5) | "lo, w" |
| mirror(**s**) | Returns the string inverted from the string **s** | mirror("HELLO") | "OLLEH" |
| right(**s**, **n**) | Returns a string of the last **n** characters of the string **s** | right(str, 3) | "rld" |
| str(**a**) | Returns a string of number **a** in decimal representation | str(13.25) | 13.250000 |
| strops(**s**, **p**) | Returns the first position in the string **s** that matches the string **p** (The first character position will be 0 or -1 if there is none.) | strpos(str, "llo")
strpos(str, "hi")
| 2
-1
|