Exploring the "else if" Statements in a JavaScript Calculator

I need help with modifying a calculator created by a former colleague at my workplace. Unfortunately, I haven't been able to contact them and I was hoping someone here could assist me. My knowledge of javascript is limited, so please bear with me if my question sounds silly or if I'm overlooking something obvious. I've searched everywhere for information but couldn't find anything, so any guidance would be greatly appreciated!

Here is the current code snippet that I want to update:

function date(){ 
        var the_date  = new Date();
    enter code herethe_year  = the_date.getFullYear();
    ret_age=Number(document.calculator.year.value);
    gender=Number(document.calculator.sex.value);
    a=the_year-ret_age;
    if (a<=36)
      {
    document.calculator.number3.value=68;
      }
    else if (a>36 && a<=45)
      {
    document.calculator.number3.value=67;
      }
      else if (a>=45 && a<=60)
      {
    document.calculator.number3.value=66;
      }
        else if (a>60 && gender==1)
      {
    document.calculator.number3.value=65;
      }
        else if (a>60 && gender==0)
      {
    document.calculator.number3.value=65;
      }

    else
      {
      alert("Our calculator is having trouble working out your state pension age. You have been given a default age of 68. Feel free to change it.");
        document.calculator.number3.value=68;
      }

        }

I am looking to add these new 'else if' options, but I suspect there might be an issue with the number of conditions in each one.

        else if (a>60 && gender==0)
      {
    document.calculator.number3.value=65;
      }
        else if (a>60 && a<=62 && gender==0)
      {
    document.calculator.number3.value=62;
      }
        else if (a>63 && gender==0)
      {
    document.calculator.number3.value=60;
      }

Am I making a mistake by trying to use e.g., a<61 && <=63 in conjunction with the gender condition? It seems to only work when I specify one condition for the number, like a<60.

Is there a way to incorporate these two conditions in the else if statement, or should I approach this differently?

Your assistance would be greatly appreciated - once again, I apologize if my explanation is unclear. If you need more information to assist me, please let me know! I'm feeling a bit lost. Thank you! :)

Answer №1

In this code snippet, you forgot to include an 'a' after the '&&' in the following condition:

else if (a>60 && <=62 && gender==0)

Answer №2

The double ampersand (&&) symbolizes that an additional condition must be met for the if statement to be considered true. It does not apply a condition directly to the preceding variable.

For instance, if you had two separate if statements:

if(x > 1){
   if(y < 1){
      // execute something
   };
};

These could be merged into a single if statement like so:

if(x > 1 && y < 1){
    // perform an action
};

In essence, both sides of the && operator (or || for an "or" condition) must stand alone when evaluated.

Therefore, as mentioned in another response earlier, you should modify your if statement from:

else if (a>60 && <=62 && gender==0)
      {
    document.calculator.number3.value=62;
      }

To:

else if (a>60 && a<=62 && gender==0)
      {
    document.calculator.number3.value=62;
      }

Answer №3

Your conditions within the if statements are incorrect

Substitute

else if (a>60 && <=62 && gender==0)
with
else if (a>60 & a<=62 && gender==0)

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