For AI agents: the complete documentation index is available at /llms.txt, the full documentation bundle is available at /llms-full.txt, and this page is available as Markdown at /reference/function.md.
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    Function

    after
    Creates a new function that invokes the original function starting from the n-th call.
    ary
    Creates a new function that limits the number of arguments a function can accept.
    asyncNoop
    A function that asynchronously does nothing.
    before
    Creates a new function that limits the number of times a function can be called.
    call
    Invokes a function with the provided arguments and returns the result.
    callAsync
    Invokes a function returning a Promise with the provided arguments.
    curry
    Curries a function so it can be called with one argument at a time.
    curryRight
    Curries a function from right to left so it can be called with one argument at a time.
    debounce
    Creates a debounced function that delays the invocation of a function.
    flow
    Creates a new function that executes multiple functions in sequence.
    flowAsync
    Creates an async pipeline that awaits each step before passing the result to the next function.
    flowRight
    Creates a new function that executes the given functions in sequence from right to left.
    identity
    Returns the input value as is.
    ifElse
    Returns a function that branches between two functions based on a predicate.
    memoize
    Caches function results so it runs faster when called again with the same arguments.
    negate
    Creates a new function that inverts the return value of a function that returns true or false.
    noop
    An empty function that does nothing.
    once
    Creates a new function that limits a function to be executed only once.
    partial
    Creates a new function with some arguments pre-applied.
    partialRight
    Creates a new function with some parameters pre-applied from the right.
    rest
    Creates a new function that bundles parameters from a specific index into an array and passes them to the function.
    retry
    Retries a Promise-returning function until it succeeds.
    spread
    Creates a new function that spreads a parameter array into individual parameters of the function.
    tap
    Returns a function that runs a side-effect and returns the value unchanged.
    throttle
    Limits a function to be executed at most once per specified time interval.
    unary
    Creates a new function that limits a function to accept only the first parameter.
    unless
    Returns a function that applies a transform only when a predicate fails, otherwise returns the value unchanged.
    when
    Returns a function that applies a transform only when a predicate passes, otherwise returns the value unchanged.