JavaScript 배열 reduce()

1 개요

JavaScript Array.reduce()

자바스크립트 배열 reduce()

const numbers = [100, 20, 10];
const result = numbers.reduce(function(total, num) {
  return total + num;
});
console.log( result ); // 130 = 100 + 20 + 10

const numbers = [100, 20, 10];
const reducer = (accumulator, currentValue) => accumulator + currentValue;
console.log(numbers.reduce(reducer));    // 130 = 100 + 20 + 10
console.log(numbers.reduce(reducer, 5)); // 135 = 5 + 100 + 20 + 10

const numbers = [100, 20, 10];
const result = numbers.reduce(function(total, num) {
  return total - num;
});
console.log( result ); // 70 = 100 - 20 - 10

2 같이 보기

• JavaScript 배열
• JavaScript 배열 map()
• JavaScript 배열 filter()
• JavaScript 배열 reduceRight()
• 함수 array_reduce()

3 참고

• https://www.w3schools.com/jsref/jsref_reduce.asp
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce