二、findIndex()方法: 功能:返回第一个满足条件的元素的索引,无符合项时返回-1。 const fruits = ['apple', 'banana', 'cherry', 'date']; const index = fruits.findIndex((fruit) => fruit === 'cherry'); console.log(index); //结果:2,因为cherry在数组fruits中的索引是2。 1. 2. 3. 4....
Given a Python list, we have to find the index of an item in a list. Submitted by Nijakat Khan, on July 15, 2022 To find the index of the specific element from the list, we can use the following methods:1) Using index() MethodThe index() method is used to find the index ...
C# List FindIndexThe FindIndex method returns the zero-based index of the first element that matches the predicate. If no element is found, it returns -1. public int FindIndex(Predicate match); public int FindIndex(int startIndex, Predicate match); public int FindIndex(int startIndex, int...
Finding the index of an item in a list: In this tutorial, we will learn how to find the index of a given item in a Python list. Learn with the help of examples.
Use themax()andoperator.itemgetter()Functions to Find the Index of the Maximum Element in a List in Python Theitemgetter()function from theoperatormodule returns a callable object which can be utilized to get an element from its operand (the operand being iterable). ...
FindLastIndex(Int32, Predicate<T>) 搜尋符合指定之述詞所定義的條件之項目,並傳回List<T>中從第一個項目延伸到指定之索引的項目範圍內,最後一個符合項目之以零為起始的索引。 FindLastIndex(Int32, Int32, Predicate<T>) 搜尋符合指定之述詞所定義的條件之項目,並傳回List<T>中包含指定之項目數目,且結束...
To find the index of an element in an int array in Java, you can use the indexOf() method of the Arrays class. The indexOf() method returns the index of the first occurrence of the specified element in the array, or -1 if the element is not found. Here is an example of how ...
2. Using theindex()Method (For Finding the First Occurrence) Theindex()method is used to find the index of the first occurrence of a specified element in a list. This method is particularly useful when you need to know the position of a specific element within a list. ...
Use theindex()Function to Find the First Index of an Element in a NumPy Array In this method, we will first convert the array to a list using thetolist()function. Then we will use theindex()function, which will return the position of the specified element. ...
This post will discuss how to find the index of the first occurrence of an element in a C++ array.1. Using std::findThe C++ standard library offers the std::find function which returns an iterator to the first matching element in the specified range, or an iterator to the end of the ...