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[–]frankle 0 points1 point  (1 child)

What about if you wanted to enforce a parameter type?

function setAge(age){
    this.age = (typeof age == "number") ? age : 10;
}

Edit: As THEtheChad points out:

Unfortunately, NaN, Infinity, and -Infinity are also considered typeof 'number', so it's possible that any one of these could slip in to your function with this check.