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No import is needed.

Read the span guide for usage and backing-storage semantics.

contains

Returns whether the collection contains the requested key or value.

public fun contains(borrow sub: string): bool

index_of

Returns the first matching index, or None when no match exists.

public fun index_of(c: char, from: int): Option<int>

index_of

Returns the first matching index, or None when no match exists.

public fun index_of(borrow sub: string): Option<int>

index_of

Returns the first matching index, or None when no match exists.

public fun index_of(borrow sub: string, from: int): Option<int>

last_index_of

Returns the last matching index, or None when no match exists.

public fun last_index_of(c: char): Option<int>

last_index_of

Returns the last matching index, or None when no match exists.

public fun last_index_of(borrow sub: string): Option<int>