indexOf

public int indexOf(T searchElement)

public int indexOf(T searchElement, int startingIndex)

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

The first 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.

startingIndex

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

Returns the first 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 first index of the search element in the array with the search beginning at the specified starting 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.

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

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

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