javascriptternary-operator

Assign only if condition is true in ternary operator in JavaScript

Is it possible to do something like this in JavaScript?

max = (max < b) ? b;

In other words, assign value only if the condition is true. If the condition is false, do nothing (no assignment). Is this possible?

Solution

  • Don't use the ternary operator then, it requires a third argument. You would need to reassign max to max if you don't want it to change (max = (max < b) ? b : max).

    An if-statement is much more clear:

    if (max < b) max = b;

    And if you need it to be an expression, you can (ab)use the short-circuit-evaluation of AND:

    (max < b) && (max = b)

    Btw, if you want to avoid repeating variable names (or expressions?), you could use the maximum function:

    max = Math.max(max, b);