# The `Array.indexOf` function

## Returns correct result with string search

### Juttle

    emit -from Date.new(0) -limit 1 | put result = Array.indexOf(['A','B'], 'B') | view result

### Output

    { "time": "1970-01-01T00:00:00.000Z", result: 1 }

## Returns correct result with number search

### Juttle

    emit -from Date.new(0) -limit 1 | put result = Array.indexOf([1,'B'], 1) | view result

### Output

    { "time": "1970-01-01T00:00:00.000Z", result: 0 }

## Returns correct result with non-primitive search

### Juttle
    const a = ['a'];
    emit -from Date.new(0) -limit 1 | put result = Array.indexOf([1,a], a) | view result

### Output

    { "time": "1970-01-01T00:00:00.000Z", result: 1 }

## Returns correct result when item not found

### Juttle

    emit -from Date.new(0) -limit 1 | put result = Array.indexOf([1,2], 3) | view result

### Output

    { "time": "1970-01-01T00:00:00.000Z", result: -1 }

## Returns correct result when non-primitive item not found

### Juttle

    emit -from Date.new(0) -limit 1 | put result = Array.indexOf([1,2], [1]) | view result

### Output

    { "time": "1970-01-01T00:00:00.000Z", result: -1 }

## Produces an error when passed argument `array` of incorrect type

### Juttle

    emit -from Date.new(0) -limit 1 | put result = Array.indexOf(null, '1') | view result

### Warnings

  * Invalid argument type for "Array.indexOf": expected array, received null.