The method executes the function once for each element present in the array:

The Array. find() method takes a callback function as parameter and executes that function once for each element present in the array, until it finds one where the function returns a true value. If the element is found it returns the value of the element, otherwise undefined is returned.

Use findIndex() Method to Find the Index of the Object in an Array in JavaScript. ES6 added a new method called findIndex() to the Array. prototype , which returns the first element in an array that passes the provided test.

The includes() method checks if a value is in an array. This method returns true or false depending on the outcome. The filter() method determines if an array of objects contains a particular value. This method returns the object that meets a certain criterion if it exists in the array.

TypeScript – Array indexOf()

1. searchElement − Element to locate in the array.
2. fromIndex − The index at which to begin the search. Defaults to 0, i.e. the whole array will be searched. If the index is greater than or equal to the length of the array, -1 is returned.

1. If it finds an array element where the function returns a true value, findIndex() returns the index of that array element (and does not check the remaining values)
2. Otherwise it returns -1.

JavaScript Array includes() The includes() method returns true if an array contains a specified element, otherwise false . includes() is case sensitive.

The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. Otherwise, it returns -1, indicating that no element passed the test.

An element in an ArrayList can be searched using the method java.util.ArrayList.indexOf (). This method returns the index of the first occurance of the element that is specified.

This is a Java Program to Search Key Elements in an Array. Enter the size of array and then enter all the elements of that array. Now enter the element you want to search for. With the help of for loop we can find out the location of the element easily. Here is the source code of the Java Program to Search Key Elements in an Array.

Arrays in JavaScript are zero-based. This means that JavaScript starts counting from zero when it indexes an array. In other words, the index value of the first element in the array is “0” and the index value of the second element is “1”, the third element’s index value is “2”, and so on. This is not unusual in computer programming languages.

Each variable or object in an array is called an element. Unlike stricter languages, such as Java, you can store a mixture of data types in a single array. For example, you could have array with the following four elements: an integer, a window object, a string and a button object .