array map reduce code example

Example 1: map and reduce an array in js

const rebels = pilots.filter(pilot => pilot.faction === "Rebels");const empire = pilots.filter(pilot => pilot.faction === "Empire");

Example 2: reduce javascript

/* this is our initial value i.e. the starting point*/
const initialValue = 0;

/* numbers array */
const numbers = [5, 10, 15];

/* reducer method that takes in the accumulator and next item */
const reducer = (accumulator, item) => {
  return accumulator + item;
};

/* we give the reduce method our reducer function
  and our initial value */
const total = numbers.reduce(reducer, initialValue)

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Javascript Example

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