Array.FindIndex Method Reference Feedback Definition Namespace: System Assemblies: netstandard.dll, System.Runtime.dll Searches for an element that matches the conditions defined by a specified predicate, and returns the zero-based index of the first occurrence within anArrayor a portion of it. ...
This method is an O(n) operation, whereniscount. See also Exists<T>(T[], Predicate<T>) Find<T>(T[], Predicate<T>) FindLast<T>(T[], Predicate<T>) FindAll<T>(T[], Predicate<T>) BinarySearch IndexOf LastIndexOf Predicate<T> ...
This method is an O(n) operation, whereniscount. See also Exists<T>(T[], Predicate<T>) Find<T>(T[], Predicate<T>) FindLast<T>(T[], Predicate<T>) FindAll<T>(T[], Predicate<T>) BinarySearch IndexOf LastIndexOf Predicate<T> ...
The findIndex() method returns the index of the first element in an array that pass a test (provided as a function).The findIndex() method executes the function once for each element present in the array:If it finds an array element where the function returns a true value, findIndex()...
ThefindIndex()method returns the index (position) of the first element that passes a test. ThefindIndex()method returns -1 if no match is found. ThefindIndex()method does not execute the function for empty array elements. ThefindIndex()method does not change the original array. ...
测试1:返回数组中第一个大于15的数的index functionisBigEnough(element,index,array) {returnelement >=15; }console.log([12,5,8,130,44].findIndex(isBigEnough,this));// 3console.log([12,5,8,130,44]._findIndex(isBigEnough,this));// 3 ...
React Js Array findIndex() Method:The findIndex() method in React.js is a function that operates on arrays and is used to find the index of the first element in the array that satisfies a given condition. It takes a callback function as an argument, which is executed for each element...
public: int FindIndex(Predicate<T> ^ match); Parameters match Predicate<T> Returns Int32 Applies to Visual Studio SDK 2022 和 Visual Studio SDK 2019 产品版本 Visual Studio SDK 2019, 2022 FindIndex(Int32, Predicate<T>) C++ 复制 public: int FindIndex(int startIndex, Predicate<T> ^...
findIndex() Return Value Returns theindexof thefirst elementin the array that satisfies the given function. Returns-1if none of the elements satisfy the function. Example 1: Using findIndex() method // function that returns even numberfunctionisEven(element){returnelement %2==0; ...
find()和findIndex()方法和filter()很像,遍历所有元素并找出那些让你的predicate函数返回truthy值的元素,但不一样的点在于,这两个方法会在遇到第一个让predicate函数返回true的时候,终止遍历。这时候,find()返回该元素,findIndex()返回该元素的索引。如果没有找到这个元素,find()返回undefined,findIndex()返回-1:...