[javascript] Shorthand for if-else statement

I have some code with a lot of if/else statements similar to this:

var name = "true";

if (name == "true") {
    var hasName = 'Y';
} else if (name == "false") {
    var hasName = 'N';
};

But is there a way to make these statements shorter? Something like ? "true" : "false" ...

Try this method;

Shorthand method:

let variable1 = '';_x000D_
_x000D_
let variable2 = variable1 || 'new'_x000D_
console.log(variable2); // new

Longhand method:

 let variable1 = 'ya';_x000D_
 let varibale2;_x000D_
_x000D_
 if (variable1 !== null || variable1 !== undefined || variable1 !== '')_x000D_
       variable2 = variable1;_x000D_
_x000D_
console.log(variable2); // ya

Try like

var hasName = 'N';
if (name == "true") {
    hasName = 'Y';
}

Or even try with ternary operator like

var hasName = (name == "true") ? "Y" : "N" ;

Even simply you can try like

var hasName = (name) ? "Y" : "N" ;

Since name has either Yes or No but iam not sure with it.

You can use an object as a map:

  var hasName = ({
        "true"  : "Y",
        "false" : "N"
  })[name];

This also scales nicely for many options

  var hasName = ({
        "true"          : "Y",
        "false"         : "N",
        "fileNotFound"  : "O"
  })[name];

(Bonus point for people getting the reference)

Note: you should use actual booleans instead of the string value "true" for your variables indicating truth values.

Most answers here will work fine if you have just two conditions in your if-else. For more which is I guess what you want, you'll be using arrays. Every names corresponding element in names array you'll have an element in the hasNames array with the exact same index. Then it's a matter of these four lines.

names = "true";
var names = ["true","false","1","2"];
var hasNames = ["Y","N","true","false"];
var intIndex = names.indexOf(name);
hasName = hasNames[intIndex ];

This method could also be implemented using Objects and properties as illustrated by Benjamin.

?: Operator

If you want to shorten If/Else you can use ?: operator as:

condition ? action-on-true : action-on-false(else)

For instance:

let gender = isMale ? 'Male' : 'Female';

In this case else part is mandatory.

&& Operator

In another case, if you have only if condition you can use && operator as:

condition && action;

For instance:

!this.settings && (this.settings = new TableSettings());

FYI: You have to try to avoid using if-else or at least decrease using it and try to replace it with Polymorphism or Inheritance. Go for being Anti-If guy.

Try this

hasName = name ? 'Y' : 'N';