The following example uses findIndex() method to find the first occurrence of a prime number in a given array. The findIndex() executes testFunc() for every element of the array and if true is returned by the testFunc(), findIndex() returns the index of that element and does not check for the rest of the array elements Example Code In JavaScript, 'this' keyword refers to the object it belongs to. If it is empty, the value 'undefined' will be passed as its 'this' value. It is an optional argument that is passed to the function and used as its 'this' value. Index: Indicates the index of the current element being processed.Īrr: This is the array that the findIndex() was called upon. The testFunc() is a function that is used to execute a condition on each element of the array until the function returns true, indicating that the element satisfying the condition was found.ĬurrentValue: This indicates the current element in the array being processed. The above findIndex() method takes two arguments: The syntax of the findIndex() method is as follows findIndex(testfunc(currentValue, index, arr), thisValue) If no element of the array satisfies the testing condition, it returns -1. Enable JavaScript to view data.The findIndex() method returns the index of the first element in array that satisfies the given testing function. Especificaciones SpecificationĮCMAScript Language Specification # īCD tables only load in the browser with JavaScript enabled. Si necesita soporte para motores de JavaScript obsoletos que no soportan fineProperty es mejor no emplear polyfills para métodos Array.prototype, ya que no puede hacerlos no-enumerables.

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Javascript array findindex