Clamp looped numbers such as Radians, Degrees, etc.

loopNum.js

function loopNum(x, lim) {
    return x - lim * Math.floor(x / lim);
}

console.log([
    loopNum(1, 360),       // 1
    loopNum(361, 360),     // 1
    loopNum(-1, 360),      // 359
    loopNum(-361, 360),    // 359
    loopNum(0.1, 3.1415),  // 0.1
    loopNum(-0.1, 3.1415), // 3.0415
    loopNum(3.5, 3.1415),  // 0.3585
    loopNum(-3.5, 3.1415), // 2.783
]);