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15 paź 2013 · For arrays you can use: Array.FindIndex<T>: int keyIndex = Array.FindIndex(words, w => w.IsKey); For lists you can use List<T>.FindIndex: int keyIndex = words.FindIndex(w => w.IsKey); You can also write a generic extension method that works for any Enumerable<T>: ///<summary>Finds the index of the first item matching an expression in an enumerable.
an array does not contain index when elements are associative. An array in php can contain mixed values like this: $var = array("apple", "banana", "foo" => "grape", "carrot", "bar" => "donkey"); print_r($var); Gives you: Array ( [0] => apple [1] => banana [foo] => grape [2] => carrot [bar] => donkey )
26 sie 2024 · The array_flip() function swaps keys and values in an array. You can use it to find the index of an element by flipping the array and checking if the element exists as a key. If it exists, its value will be the original index. Example: PHP
Searches for an element that matches the conditions defined by the specified predicate, and returns the zero-based index of the first occurrence within the range of elements in the Array that extends from the specified index to the last element.
5 gru 2021 · This post will discuss how to find the index of an element in an array in C#. The solution should either return the index of the first occurrence of the required element or -1 if it is not present in the array. 1. Using Array.IndexOf () method.
Searches for the specified object and returns the index of its first occurrence in a one-dimensional array. public: static int IndexOf (Array ^ array, System::Object ^ value); public static int IndexOf (Array array, object value); public static int IndexOf (Array array, object? value); static member IndexOf : Array * obj -> int.
To find the index of a key in an array in PHP, you can use array_search() function. Call array_search() function, and pass the key, and array keys as arguments. The function returns an integer value representing the index of the key in the array.
