indexOf (Function)

Signature: indexOf(s: string, needle: string) -> Result<int, Error>

Description: Returns the byte index of needle's first occurrence, or Error with 'indexOf: substring not found'.

Parameters

• s (string): The string to search in
• needle (string): The substring to locate

Returns: Result<int, Error>

Example

match indexOf("foo=bar", "=") { Success { value } => print(value) ... }

match indexOf ("foo=bar", "=")
    Success value => print value
    Error message => print "not found"