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 ...
how I find a index of element in a array? Answers (2) 0 Vulpes NA96k2.6m10y Try this: using System; class Program { static void Main() { string[] planets = {"mercury", "venus", "earth", "mars", "saturn", "jupiter", "uranus", "neptune", "pluto"}; ...
find() 并没有改变数组的原始值。 2. findIndex() findIndex() 方法返回传入一个测试条件(函数)符合条件的数组第一个元素位置。 当数组中的元素在测试条件时返回true时, findIndex() 返回符合条件的元素的索引位置(注:find()返回的是元素),之后的值不会再调用执行函数。如果没有符合条件的元素返回-1(注:fin...
callback(element, index, array):接收当前元素、索引和原数组作为参数,需返回布尔值。 thisArg(可选):指定回调函数中的 this 上下文。 特点: 短路操作:找到第一个匹配项后立即停止遍历。 适用场景:查找对象数组中符合条件的对象。 const users = [ {id: 1, name: 'Alice'}, {id: 2, name: 'Bob'} ];...
Modify the program to return the index using binary search. Write a program to find the closest index where an element could be inserted. Java Code Editor: Write a Java program to find the subarray with smallest sum from a given array of integers. ...
// returns the index of the first odd number in the arrayletfirstOdd = numbers.findIndex(isOdd); console.log(firstOdd);// Output: 2 Run Code findIndex() Syntax The syntax of thefindIndex()method is: arr.findIndex(callback(element, index, arr),thisArg) ...
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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 ...
function isPrime(element, index, array) { var start = 2; while (start <= Math.sqrt(element)) { if (element % start++ < 1) { return false; } } return element > 1; } console.log([4, 6, 8, 12].find(isPrime)); // undefined console.log([4, 5, 8, 12].find(isPrime)); /...
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 ...