Struct RandBetweenFn 

pub struct RandBetweenFn;

Trait Implementations

impl Debug for RandBetweenFn

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Function for RandBetweenFn

Returns a random integer between two inclusive bounds.

RANDBETWEEN evaluates both bounds, then samples an integer in [low, high].

Remarks

• Bounds are coerced to numbers and truncated to integers.
• If high < low, the function returns #NUM!.
• The function is volatile and may return a different integer each recalculation.

Examples

title: "Value always falls inside the requested interval"
formula: "=LET(n, RANDBETWEEN(1, 3), AND(n>=1, n<=3, INT(n)=n))"
expected: true

title: "Equal bounds produce a fixed value"
formula: "=RANDBETWEEN(7, 7)"
expected: 7

title: "Upper bound below lower bound is invalid"
formula: "=RANDBETWEEN(5, 1)"
expected: "#NUM!"

related:
  - RAND
  - INT
  - LET
faq:
  - q: "Are both bounds included in RANDBETWEEN?"
    a: "Yes. RANDBETWEEN samples an integer in the closed interval [low, high]."
  - q: "What happens with decimal bounds like RANDBETWEEN(1.9, 4.2)?"
    a: "Bounds are truncated to integers before sampling, so this behaves like RANDBETWEEN(1, 4)."
  - q: "Is RANDBETWEEN deterministic?"
    a: "It is volatile, so results can change on recalculation, though a single evaluation context uses seeded randomness for reproducible execution."

[formualizer-docgen:schema:start] Name: RANDBETWEEN Type: RandBetweenFn Min args: 2 Max args: 2 Variadic: false Signature: RANDBETWEEN(arg1: number@scalar, arg2: number@scalar) Arg schema: arg1{kinds=number,required=true,shape=scalar,by_ref=false,coercion=NumberLenientText,max=None,repeating=None,default=false}; arg2{kinds=number,required=true,shape=scalar,by_ref=false,coercion=NumberLenientText,max=None,repeating=None,default=false} Caps: VOLATILE [formualizer-docgen:schema:end]

fn caps(&self) -> FnCaps

Capability flags for this function

fn name(&self) -> &'static str

fn min_args(&self) -> usize

fn arg_schema(&self) -> &'static [ArgSchema]

fn eval<'a, 'b, 'c>( &self, args: &'c [ArgumentHandle<'a, 'b>], ctx: &dyn FunctionContext<'b>, ) -> Result<CalcValue<'b>, ExcelError>

The unified evaluation path.

fn namespace(&self) -> &'static str

fn variadic(&self) -> bool

fn volatile(&self) -> bool

fn aliases(&self) -> &'static [&'static str]

Optional list of additional alias names (case-insensitive) that should resolve to this function. Default: empty slice. Implementors can override to expose legacy names. Returned slice must have ’static lifetime (typically a static array reference).

fn function_salt(&self) -> u64

fn eval_reference<'a, 'b, 'c>( &self, _args: &'c [ArgumentHandle<'a, 'b>], _ctx: &dyn FunctionContext<'b>, ) -> Option<Result<ReferenceType, ExcelError>>

Optional reference result path. Only called by the interpreter/engine when the callsite expects a reference (e.g., range combinators, by-ref argument positions, or spill sources).

fn dispatch<'a, 'b, 'c>( &self, args: &'c [ArgumentHandle<'a, 'b>], ctx: &dyn FunctionContext<'b>, ) -> Result<CalcValue<'b>, ExcelError>

Dispatch to the unified evaluation path with automatic argument validation.