When make a function, I check that the required parameters are filled in as seen below.
Question
It is not really a good way, as all it does is assigning a default value to a missing parameter. I'd much rather have that execution stops and tells me which function is missing a parameter. How is that done, if possible?
func({
system: "test1",
type: "test2",
summary: "test3",
description: "test4",
});
function func (c) {
c = c || {};
c.system = c.system || "Missing system";
c.type = c.type || 'Missing type';
c.summary = c.summary || 'Missing summary';
c.description = c.description || 'Missing description';
console.log(c);
console.log(c.system);
console.log(c.type);
console.log(c.summary);
console.log(c.description);
};
Throwing an error if doesnt find the value.
if(!c.system) throw new Error("Missing system"); // This would fail if c.system is falsy
// In this case can be used:
if(!c.hasOwnProperty("system")) throw new Error("Missing system")
Can create a function to check this.
function Check(objt, key, messageError){
if(!objt.hasOwnProperty(key)) throw new Error(messageError)
}
Check(c, "system", "Missing system");