find-index-x
This method returns the index of the first element in the array that satisfies the provided testing function.
module.exports
⇒ number
⏏
Like findIndex
, this method returns an index in the array, if an element
in the array satisfies the provided testing function. Otherwise -1 is returned.
Kind: Exported member
Returns: number
- Returns index of positively tested element, otherwise -1.
Throws:
TypeError
If array isnull
orundefined
-TypeError
Ifcallback
is not a function.
Param | Type | Description |
---|---|---|
array | Array |
The array to search. |
callback | function |
Function to execute on each value in the array, taking three arguments: element , index and array . |
[thisArg] | * |
Object to use as this when executing callback . |
Example
; { let start = 2; while start <= Math if element % start < 1 return false; start += 1; return element > 1;} console; // -1, not foundconsole; // 2