The find() method is used to get the value of the first element in the array that satisfies the provided condition.

If the context is passed, it will be used like this for each invocation of the callback function, otherwise undefined is used as default.ĭocument.getElementById('agefilter').innerHTML = ages.filter(checkSeniorCitizone)

thisValue: This parameter optional, it holds the context to be passed as this to be used while executing the callback function.

arr: This parameter optional, it holds the complete array on which Array.

index: This parameter optional, it holds the index of the currentValue element in the array.

element: The parameter holds the value of the elements being processed currently.

callback: This parameter holds the function to be called for each element of the array.

Syntax: array.filter(callback(element, index, arr), thisValue)

Filter() doesn’t change the original array.

The filter() method is used to create a new array from a given array consisting of only those elements from the given array which satisfy a condition set by the argument method.

This are using to find some data from the array. In this example, we used the array.findIndex() method to get the first index with a value over 20.In this article, we will learn about how to use filter, find and findIndex methods of array in JavaScript. If an element matches the condition, the function will return that element’s index position as the output. We need to use a function and the current value as parameters in the array.findIndex() method. In JavaScript, we can use the array.findIndex() method to get the first element from the array that matches a particular condition. Example Code: Use the array.findIndex() Method to Get the First Element With a Value Over 20 This method returns the first index matching the condition specified in the function. this This optional parameter is used in the callback function to invoke the array object. index The index of the element is optional. currentValue The current value is required to find the first index that matches the given condition. Parameters callback function() To specify a condition and run the function for each element.

Refarr.findIndex( function(currentValue, index, arr), this) Refarr.findIndex( function(currentValue))

Findindex in javascript