JS exercises

exercises.js

function solution(input, markers) {
  const lines = input.split('\n');
  const strippedLines = lines.map((line) => {
    let strippedLine = line;
    markers.forEach((marker) => {
      if (line.includes(marker)) {
        const index = line.indexOf(marker);
        strippedLine = line.slice(0, index);
      }
    });
    return strippedLine.trim();
  });
  return strippedLines.join('\n');
}

const zero = (operation) => (operation ? operation(0) : 0);
const one = (operation) => (operation ? operation(1) : 1);
const two = (operation) => (operation ? operation(2) : 2);
const three = (operation) => (operation ? operation(3) : 3);
const four = (operation) => (operation ? operation(4) : 4);
const five = (operation) => (operation ? operation(5) : 5);
const six = (operation) => (operation ? operation(6) : 6);
const seven = (operation) => (operation ? operation(7) : 7);
const eight = (operation) => (operation ? operation(8) : 8);
const nine = (operation) => (operation ? operation(9) : 9);

const plus = (a) => (b) => b + a;
const minus = (a) => (b) => b - a;
const times = (a) => (b) => b * a;
const dividedBy = (a) => (b) => Math.floor(b / a);