String.starts_with-question-mark

You're seeing just the function starts_with-question-mark, go back to String module for more information.

starts_with?(string, prefix)

Specs

starts_with?(t(), pattern()) :: boolean()

Returns true if string starts with any of the prefixes given.

prefix can be either a string, a list of strings, or a compiled pattern.

Examples

iex> String.starts_with?("elixir", "eli")
true
iex> String.starts_with?("elixir", ["erlang", "elixir"])
true
iex> String.starts_with?("elixir", ["erlang", "ruby"])
false

A compiled pattern can also be given:

iex> pattern = :binary.compile_pattern(["erlang", "elixir"])
iex> String.starts_with?("elixir", pattern)
true

An empty string will always match:

iex> String.starts_with?("elixir", "")
true
iex> String.starts_with?("elixir", ["", "other"])
true