The conditinal operator executes expressions based on a simple check if the condition true or false. Writing this code is also pretty simple and the syntax is as follows:

condition ? exprIfTrue : exprIfFalse
				

The condition is followed by the operator (?). Then the expression to be executed if "truthy" and the expression if "falsy", seperated by (:).

The conditional operator is used as a quick way of running an "if" statement.

var age = 20;
var legalStatus;

//using "if" statement

if(age >= 21){
	legalStatus = "Legal to consume alcohol";
}else{
	legalStatus = "Illegal to consume alcohol";
} 

//using conditional operator

legalStatus = (age >= 21) ? "Legal to consume alcohol" : "Illegal to consume alcohol";
				

The operator is commonly used to hand values that may be null. Type your name in the box then click "Submit", then try it without typing anything.

function nameDisplay(){
	var txtName = document.getElementById("yourName") ;
	var name = txtName.value ? txtName.value : "stranger";
	
	alert("Greetings, " + name);
}
				

When the text box is left blank it leaves a "null" value. It's much easier using the conditional operator for something so simple, but most importantly for checking if a value is null. This operator can also be "chained" similar to "else if" statements.

function example(…) {
    return condition1 ? value1
         : condition2 ? value2
         : condition3 ? value3
         : value4;
}

// Equivalent to:

function example(…) {
    if (condition1) { return value1; }
    else if (condition2) { return value2; }
    else if (condition3) { return value3; }
    else { return value4; }
}

//Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_Operator
				

It makes for easier to read code, and you can probably benefit from using it.