You can use this to get the index of a specific item: Code Block Swift let index = myArray.firstIndex(of: item)If you want to find an item based on a condition use this: Code Block Swift let index = myArray.firstIndex(where: { item in item.title.count < 5 }) 0 Copy BabyJ a...
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 ...
We can also implement our custom function to return the index of the first occurrence of the specified element in an array. The idea is to perform a linear search on the array using a regular for loop, and terminate the search on the first matching item. If the array is sorted, we ...
CreateInstanceFromArrayType 空 Exists Fill 查找 FindAll FindIndex FindLast FindLastIndex ForEach GetEnumerator GetLength GetLongLength GetLowerBound GetUpperBound GetValue IndexOf Initialize LastIndexOf Resize Reverse SetValue 排序 TrueForAll 显式接口实现 ...
a=np.array([7,8,9,5,2,1,5,6,1])print(np.where(a==1)[0][0]) Output: 5 Use thenonzero()Function to Find the First Index of an Element in a NumPy Array Thenonzero()function returns the indices of all the non-zero elements in a numpy array. It returns tuples of multiple ...
index 正在处理的元素在数组中的索引。 array 调用了 findIndex() 的数组本身。 thisArg 可选 执行callbackFn 时用作 this 的值。参见迭代方法。返回值 数组中第一个满足测试条件的元素的索引。否则返回 -1。 描述 findIndex() 是一种迭代方法。它按照索引升序依次遍历数组中的每个元素,并调用提供的 callbackFn...
int item = 5; int index = list.IndexOf(item); if (index != -1) { Console.WriteLine(String.Format("Element {0} is found at index {1}", item, index)); } else { Console.WriteLine("Element not found in the given list."); } } } /* Output: Element 5 is found at index 1 ...
语法:let newArray = oldArray.map((item, index, arr) => {}) item当前元素、index当前索引、arr原数组 let arr = [1,6,9,10,100,25]; const newArr=arr.map(item=>{if(item %2===0) item=item*10 ;returnitem });//偶数*10console.log(newArr);//[1, 60, 9, 100, 1000, 25] 返...
constbeasts = ['ant','bison','camel','duck','bison'];// valueconsole.log(beasts.indexOf('bison'));// callbackconsole.log(beasts.findIndex(item=>item ==='bison')); https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf ...
findIndex() 方法返回数组中通过测试的第一个元素的索引(作为函数提供)。 findIndex() 方法对数组中存在的每个元素执行一次函数: 如果找到函数返回 true 值的数组元素,则 findIndex() 返回该数组元素的索引(并且不检查剩余值) 否则返回 -1 注释:findIndex() 不会为没有值的数组元素执行函数。