Logical Order in If Else Statements ra

JavaScript
1

Tell us what’s happening:

really, i can’t understand what’s going on here haha

Your code so far


function orderMyLogic(val) {
  if (val < 10) {
    return "Less than 10";
  } else if (val < 5) {
    return "Less than 5";
  } else {
    return "Greater than or equal to 10";
  }
}

// Change this value to test
orderMyLogic(7);
1 Like
2

What happens is just like in your math days.
a + 6 = ?;
a = 3;
3 + 6 = 9;

Just like you sub the number 3 here for a., you do the same in the function.

focus on these two lines:

function orderMyLogic(val){...}
orderMyLogic(7);

The function uses a variable called val.
So what happens here is val becomes 7. Everywhere inside the function orderMyLogic that uses val, you substitute it with the number 7.

1 Like
3

In the future, more specific questions are better.

function orderMyLogic(val) {

This is a function, a block of code that accepts a variable as a parameter, named val.

  if (val < 10) {
    return "Less than 10";

If val is less than 10, return that string. Once you return that value, the function is over.

  } else if (val < 5) {
    return "Less than 5";

If we made it past that last if (else) then check if val is less than 5, return that string. Again, once you return, you are done with the function.

  } else {

If we made it this far (else) return that string.

At this point you are done with the function because there is no condition where you would not have hit a return statement.

orderMyLogic(7);

This invokes the function and sends it the value 7, which is what val will be in the function. So, the function will return "Less than 10". Because you are not saving that returned value, you won’t be able to see it.

1 Like
4

I know all of that, but they giving me error:

orderMyLogic(4) should return "Less than 5"
5

Look at your code.

if (val < 10) {
    return "Less than 10";
} else if (val < 5) {
    return "Less than 5";
}

if val is 4, then 4 < 10 which means you return “Less than 10”. It never makes it to your 2nd else if condition.

1 Like
6

val < 10 is:
-infinity … 0 1 2 3 4 5 6 7 8 9

val < 5 is:
-infinity … 0 1 2 3 4

Since they cross over the same #s it’s better to test for the smaller range first.

1 Like
7

JaMann, danke - es hat funktioniert

function orderMyLogic(val) {
if (val < 5) {
return “Less than 5”;
} else if (val < 10) {
return “Less than 10”;
} else {
return “Greater than or equal to 10”;
}
}

// Change this value to test
orderMyLogic(7);

8

That’s why you need to ask specific questions.

9