Mathematical Javascript Tricks

Thanks to Javascript type coercion, if you need a 0 you can often get away with false instead.

k=i<5?0:2*i   // BEFORE
k=i>4&&2*i    // AFTER

Doing the same trick with || is slightly different because true acts like a 1.

k=i<8?1:2*i   // BEFORE
k=i<8||2*i    // AFTER

Similarly, true can act like a 1 for multiplication

k=50+(i>5?20:0)   // BEFORE
k=50+(i>5)*20     // AFTER

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Square followed by square-root is the same as Math.abs()

x=Math.abs(p)   // BEFORE
x=(p**2)**.5    // AFTER

But this is not always a saving. If you were to use that expression inline, and find you need brackets around the expression, then Math.abs(...) will be shorter!