将变量与OR结合使用以检查另一个变量的true / false

Question

I developed an algorithm that checks nextDay, nextMonth and nextYear (considers leap-year), with a boundary defined called weekSpan, that if it falls within it (and at a specific time defined elsewhere)... it'll perform an action . It's working right now, but I'm concerned, because my weekSpan variable is defined with OR values (eg weekSpan = 1 || 2 || 3;).

Considering that there's a variable called weekDay (value between 0 and 6) and I want to check if that weekDay falls within the weekSpan... I did something like this:

if (weekDay == weekSpan) {

  (code here)...

}

But... I tried to recreate the condition by doing something like this in Chrome's V8:

var weekSpan = 1 || 2 || 3 || 4 || 5;

var weekDay = 5;

if (weekDay == weekSpan) {

  console.log("Woooohhhh!");

}

Result: undefined.

I'm not sure which is the right way to check true or false with my code or simply do:

if (weekSpan) {

  (code here)...

}

Any ideas?

Answer 1

You could use a function with an array for the values and check against.

 const isInWeekSpan = v => [1, 2, 3, 4, 5].includes(v); console.log(isInWeekSpan(3)); console.log(isInWeekSpan(0)); 

The pattern

x = 1 || 2

returns the first truthy value 1 in combination with logical OR || . This is not an apropriate method to check a value.

Answer 2

That's not how || works. Try setting weekSpan to an array of possible numbers, and then checking if weekDay is in that array.

 var weekSpan = [1, 2, 3, 4, 5]; var weekDay = 5; if (weekSpan.includes(weekDay)) { console.log("Woooohhh!"); }