Struct IfFn 

pub struct IfFn;

Trait Implementations

impl Debug for IfFn

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

Formats the value using the given formatter.

impl Function for IfFn

Returns one value when a condition is TRUE and another when FALSE.

IF(condition, value_if_true, [value_if_false]) supports two or three arguments.

Remarks

• Condition coercion: booleans are used directly, numbers use 0 as FALSE and non-zero as TRUE.
• A blank condition is treated as FALSE.
• Text or other non-numeric/non-boolean conditions return #VALUE!.
• With only two arguments, the FALSE branch defaults to logical FALSE.

Examples

title: "Numeric condition"
formula: '=IF(2, "yes", "no")'
expected: "yes"

title: "Two-argument IF defaults false branch"
formula: '=IF(0, 10)'
expected: false

related:
  - IFS
  - IFERROR
  - IFNA
faq:
  - q: "What is returned when IF has only two arguments and condition is FALSE?"
    a: "The false branch defaults to logical FALSE when value_if_false is omitted."

[formualizer-docgen:schema:start] Name: IF Type: IfFn Min args: 2 Max args: variadic Variadic: true Signature: IF(arg1…: any@scalar) Arg schema: arg1{kinds=any,required=true,shape=scalar,by_ref=false,coercion=None,max=None,repeating=None,default=false} Caps: PURE, SHORT_CIRCUIT [formualizer-docgen:schema:end]

fn caps(&self) -> FnCaps

Capability flags for this function

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

fn min_args(&self) -> usize

fn variadic(&self) -> bool

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 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.