[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [\_Array](./rc-js-util._array.md) > [binaryIndexOf](./rc-js-util._array.binaryindexof.md) ## \_Array.binaryIndexOf property Performs a bisection search of an 'indexable' object, i.e. can be accessed by index, for example `Array`. Custom data structures are also supported. **Signature:** ```typescript static readonly binaryIndexOf: typeof arrayBinaryIndexOf; ``` ## Remarks The `indexable` parameter must be sorted ascending. Where there are multiple equal values the lowest index will be returned. See [arrayBinaryIndexOf()](./rc-js-util.arraybinaryindexof.md).