Standard Library - String Functions

`len`

fn len str -> num

Returns the length of the given string.

print len("abc") # 3

fn split str, str -> [str]

Splits the given string into substrings at each occurrence of the given separator and returns them as an array.

print split("a,b,c", ",") # ["a", "b", "c"]

fn replace str, str, str -> str

Replaces all occurrences of the given substring in the given string with the given replacement.

print replace("abcabc", "a", "x") # "xbcxbc"

fn substring str num num -> str

Returns the substring of the given string starting at the given index and ending at the given index.

print substring("abc", 1, 2) # "bc"