A Guide To Array.reduce() in JavaScript

A Guide To Array.reduce() in JavaScript

The Array.reduce() method reduces the array to a single value. The reduce() method takes one reducer function as the first argument and one initial value as second optional argument.

The Array.reduce() method reduces the array to a single value. The reduce() method takes one reducer function as the first argument and one initial value as second optional argument. The reducer function executes for each element of array and returns a value which further provided as the first argument (accumulator) to the next reducer function call.

array.reduce(reducerFunction, initialValue);

The reducer function takes two required arguments i.e. accumulator and currentValue. The accumulator is either the initial value or the previously returned value. The second argument is the value of the current element.

function reducerFunction(accumulator, currentValue, currentIndex, array) {}

The reducer function also takes two optional arguments i.e. currentIndex and array. The currentIndex is the index of currentValue in array and the last optional argument is the array on which the reduce() method called upon.

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