# INDEXOF

Returns the index of the first occurrence of an input number in an array of numbers. Node references are also accepted as arguments. The function returns 0 if the value is not found in the input array.

## Syntax

```javascript
indexof(list, value)
```

## Arguments

list - The input array of numbers to be checked.

value - The number to be searched for in the list.

## Example

```javascript
INDEXOF([2,4,6,8,10],8)
```

Returns 4.

```
INDEXOF([2,4,6,8,10],2)
```

Returns 1.

In the example below, the Indexof function is used to check whether the Revenue in any quarter is equal to the Sales for Q1.