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Break and Continue

Suppose we wanted to skip all the numbers that are divisible by ten, or if the number meets some special condition, exit the loop.

var i;

// Real Loop:
for (i = 0; i < 100000; i++) {
    if (i % 10 === 0) {
        continue;
    }
    if (isSpecial(i)) {
        break;
    }
    // statements
}

// Clumpy Equivalent:
clumpy.for_loop(
    function () { i = 0; },
    function () { return i < 100000; },
    function () { i++; },
    function () {
        if (i % 10 === 0) {
            clumpy.continue_loop();
            return;
        }
        if (isSpecial(i)) {
            clumpy.break_loop();
            return;
        }
        // statements
    }
);

This is where there’s the greatest likelihood of error. Notice the return; after the clumpy.continue_loop(); statement. This is because if we don’t explicitly leave the function, JavaScript will continue to execute the rest of it.

I’ve found that a good pattern to follow is to put the return before the method invocation in the same statement (returning the result) instead of after it in a separate statement:

var i;

return clumpy.
for_loop(
    function () { i = 0; },
    function () { return i < 100000; },
    function () { i++; },
    function () {
        if (i % 10 === 0) {
            return clumpy.
            continue_loop();
        }
        if (isSpecial(i)) {
            return clumpy.
            break_loop();
        }
        // statements
    }
).
once(function () {
    // etc.
});

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