What is array.firstIndex(of:) in Swift?
Overview
The firstIndex(of:) method is used to return the first index of a specified array element.
Syntax
arr.firstIndex(of: element)
Parameters
element: The element to search for in the array or collection.
Return value
This method returns the first index where the element is found. If the element is not found, nil is returned.
Example
// create arrayslet evenNumbers = [2, 4, 6, 8, 10]let twoLetterWords = ["up", "go", "me", "we"]let names = ["John", "James", "Theodore"]// get index of some elementslet result1 = evenNumbers.firstIndex(of : 4)!let result2 = twoLetterWords.firstIndex(of: "go")!let result3 = names.firstIndex(of: "Theodore")!// print resultsprint(result1)print(result2)print(result3)
Explanation
- Lines 2 and 3: We create some arrays.
- Lines 7 to 9: We get the index of the elements specified using the
firstIndex(of:)method. And we store the results in some variables. - Lines 12 to 14: We print our results.
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