if(boolean_expression) {  
   // statement(s) will execute if the boolean expression is true
} else {
   // statement(s) will execute if the boolean expression is false  
}

var num:number = 12; 
if (num % 2==0) { 
   console.log("Even"); 
} else {
   console.log("Odd"); 
}

//Generated by typescript 1.8.10
var num = 12;
if (num % 2 == 0) {
   console.log("Even");
} else {
   console.log("Odd");
}

Even