String module

The String module contains functions to manipulate strings of text.

size/1

String.size("hello")   # 5
String.size("你好")     # 2

Parameters:

• str the string

Returns the number of characters in str.

in?/2

String.in?("bob,alice,julia", "alice")  # true
String.in?("bob,alice,julia", "fred")   # false

Parameters:

• str1 the haystack
• str2 the needle

Returns whether the needle is in the haystack.

to_number/1

String.to_number("12")     # 12
String.to_number("-12")    # -12
String.to_number("12.1")   # 12.1

Parameters:

• str the string

Returns the number which text representation is str.

from_number/1

String.from_number(13)     # "13"
String.from_number(13.2)   # "13.2"

Parameters:

• number the number

Returns the text representation of number.

to_hex/1

String.to_hex("592ac76afa") # "592AC76AFA"
String.to_hex("592AC76AFA") # "592AC76AFA"
String.to_hex("hello") # "68656C6C6F"

Parameters:

• str the string

Return the text representation of hexadecimal str. If str is already an hex it just uppercase it

to_uppercase/1

String.to_uppercase("Arsène Lupin") # "ARSÈNE LUPIN"

Parameters:

• str the string

Return the str in uppercase.

to_lowercase/1

String.to_lowercase("Sherlock Holmes") # "sherlock holmes"

Parameters:

• str the string

Return the str in lowercase.