The kangaroo function takes two arguments: x1 and v1, and x2 and v2. It calculates the x1 and x2 coordinates based on the input values and then increments them by the respective values. If the coordinates match, the function returns 'YES'; otherwise, it returns 'NO'.
function kangaroo(x1, v1, x2, v2) {
let result = 'NO';
let x1Pos = x1;
let x2Pos = x2;
for (let i = 0; i < 10000; i++) {
x1Pos += v1;
x2Pos += v2;
if (x1Pos === x2Pos) {
result = 'YES';
break;
}
}
return result;
}