![]() Finding and returning only odd numbers in the array multiplied by 2 Behavior during array mutations reduce() helps us achieve the same thing by traversing the same array only once. It generally makes us traverse the same array twice. In some cases, we need to filter and then map data. To use reduce() in place of filter() and map() Method to convert the elements to their occurrence key-value object 4. Reduce() method can be used if we are trying to count the number of each item in a collection. To showcase the elements along with their count in an array ![]() Now, let’s look at some advanced techniques with reduce() method. To eliminate duplicates from an Array Using reducer to eliminate duplicates from an array To get the sum of all values in an Array Using a reducer to get the sum of all elements in an array 2. ![]() TypeError: Reduce on an empty array with no initial value Examples of Reduce methodĮnough of theory, lets drive jump into some real-life usages of this amazing function. it will give an error when the array contains no elements or no initialValue is provided. It returns a single value after running the reducer function over the entire array to completion.īut there’s an exception to that. using Inline callback function const ans = arr.reduce( function( total, currentValue), initialValue) Code language: JavaScript ( javascript ) Return Value ![]()
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