JavaScript | Array reduce() Method The array reduce() method in JavaScript is used to reduce the array to a single value and executes a provided function for each value of the array (from left-to-right) and the return value of the function is stored in an accumulator.

var  pokemon  = ["Squirtle", "Charmander", "Bulbasaur"];

  

var  pokeLength  =

pokemon.reduce(function(previous, current) {

return  previous  +  current.length;

}, 0);

Outputs 27