lastIndexOf

public int lastIndexOf(T searchElement)

public int lastIndexOf(T searchElement, int endingIndex)

The last index of the search element in the array or -1 if the element could not be found in the array.

The last index of the search element in the array or -1 if the element could not be found in the array.

Parameters

searchElement

The element to search for.

Parameters

searchElement

The element to search for.

endingIndex

The zero-based index to limit and end the search at. This argument can be negative to specify an index relative to the end of the array.

Returns the last index of the search element in the array. By default, elements are searched by value for primitive data types and by reference otherwise. This behavior can be overridden by implementing the System.ILike<T> interface.

This method does not mutate the array.

This method was standardized in ECMAScript 5 for JavaScript. For web browsers that do not support ECMAScript 5, JS++ will provide a polyfill for this method only if it is used.

Returns the last index of the search element in the array until the specified ending index. By default, elements are searched by value for primitive data types and by reference otherwise. This behavior can be overridden by implementing the System.ILike<T> interface.

This method does not mutate the array.

This method was standardized in ECMAScript 5 for JavaScript. For web browsers that do not support ECMAScript 5, JS++ will provide a polyfill for this method only if it is used.

1 2 3 4 5 6 7 8

import System;   int[] arr = [ 1, 2, 3, 1 ]; Console.log(arr.indexOf(1));     // 0 Console.log(arr.lastIndexOf(1)); // 3 Console.log(arr.lastIndexOf(2)); // 1 Console.log(arr.lastIndexOf(3)); // 2 Console.log(arr.lastIndexOf(4)); // -1

1 2 3 4 5 6 7

import System;   int[] arr = [ 1, 2, 3, 1 ]; Console.log(arr.indexOf(1));        // 0 Console.log(arr.lastIndexOf(1));    // 3 Console.log(arr.lastIndexOf(1, 1)); // 0 Console.log(arr.lastIndexOf(1, 3)); // 3

1 2 3 4

import System;   int[] arr = [ 1, 2, 3, 1 ]; Console.log(arr.lastIndexOf(1, -2)); // 0