Here, the “ findIndex()” method comprises two parameters: “testFunc()” and “thisArg”.
Syntax of using JavaScript findIndex() methodįindIndex (testFunc (element ] ) ) The “ findIndex()” method accepts a testing function as an argument that searches for the first occurrence of the required elements and returns its “ index.” It sets the return case to” -1”, if no such element exists. However, instead of returning the element itself, it retrieves the index of that array element. The “ findIndex()” method in ES6 is quite similar to the find() method. So, let’s start! JavaScript findIndex() method This write-up will teach the usage of the JavaScript findIndex() method with the help of suitable examples. In such a scenario, JavaScript “ findIndex()” method can be utilized. It makes no difference if the value is 1 or 17 all that matters is that the particular index should be considered the first occurrence of the element with a value less than 8. For instance, in a JavaScript program, you are required to fetch the index number of the first element in an array whose value is less than 18. Sometimes, you may need to find an index of an array element to check if it satisfies the specified criteria.
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