HackerRank - Simple Array Sum

주어진 배열의 합을 구하는 문제

reduce 함수 이용 해서 풀이

 

풀이

'use strict';

import { WriteStream, createWriteStream } from "fs";
process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString: string = '';
let inputLines: string[] = [];
let currentLine: number = 0;

process.stdin.on('data', function(inputStdin: string): void {
    inputString += inputStdin;
});

process.stdin.on('end', function(): void {
    inputLines = inputString.split('\n');
    inputString = '';

    main();
});

function readLine(): string {
    return inputLines[currentLine++];
}

/*
 * Complete the 'simpleArraySum' function below.
 *
 * The function is expected to return an INTEGER.
 * The function accepts INTEGER_ARRAY ar as parameter.
 */

function simpleArraySum(ar: number[]): number {
    // Write your code here
    return ar.reduce((a, b) => a + b)
}

function main() {
    const ws: WriteStream = createWriteStream(process.env['OUTPUT_PATH']);

    const arCount: number = parseInt(readLine().trim(), 10);

    const ar: number[] = readLine().replace(/\s+$/g, '').split(' ').map(arTemp => parseInt(arTemp, 10));

    const result: number = simpleArraySum(ar);

    ws.write(result + '\n');

    ws.end();
}