how could I reduce the cyclomatic complexity?

Question

Whenever I lint a piece of code I\'m working on I get the This function\'s cyclomatic complexity is too high. (7). But I\'m a bit confused on how I could rewrit

Answer 1

Bergi has already given a correct answer, but it's still too complex for my taste. Since we're not using fortran77 I think we're better off using an early return. Also, the code may be further clarified by introducing extra variables:

function doSomething(isScrolling, start, delta, viewport) {
    if (isScrolling) return;

    var duration = +new Date() - start.time;
    var isPastHalf = Number(duration) < 250 && Math.abs(delta.x) > 20 || Math.abs(delta.x) > viewport / 2;
    var isFarRight = this.content.getBoundingClientRect().left > viewport / 2;

    // I'm not sure if my variable names reflect the actual case, but that's
    // exactly the point. By choosing the correct variable names for this,
    // anybody reading the code can immediatly comprehend what's happening.
    var isMovingToLeft = delta.x < 0;
    var isMovedPastEnd = isPastHalf && !isMovingToLeft && !(isFarRight && pulled);
    var isMovedBeforeStart = !isPastHalf && isMovingToLeft && isFarRight;

    if (isMovedPastEnd || isMovedBeforeStart) {
        this.open();
    else
        this.close();
    }
}