JS switch case condition code example

Example 1: js switch case

switch(expression) {
  case x:
    // code block
    break;
  case y:
    // code block
    break;
  default:
    // code block
}

Example 2: javascript switch

let color = "black";

switch(color){
    case "red":
        console.log("color is red");
        break;
    case "white":
        console.log("color is white");
        break;
    case "black":
        console.log("color is black");
        break;
    default:
        console.log("unknow color");
}

Example 3: js convert if/else statement to switch case

var gradeOut = 70;
var totalGrade = 80;

if (gradeOut >= 90)
    gradeOut+= "My letter grade is: A";
  else if (totalGrade < 90 && totalGrade >= 80)
    gradeOut+= "My letter grade is: B";
  else if (totalGrade < 80 && totalGrade >= 70)
    gradeOut+= "My letter grade is: C";
  else if (totalGrade < 70 && totalGrade >= 60)
    gradeOut+= "My letter grade is: D";
  else if (totalGrade < 60)
    gradeOut+= "My letter grade is: F";

//here's the same thing using switch(true). Requires var gradeOut (is currently at top of page
switch(true) {
case gradeOut<60:
    gradeOut= "My letter grade is: F";
    break;
case gradeOut<70:
    gradeOut= "My letter grade is: D";
    break;
case gradeOut<80:
    gradeOut="My letter grade is: C";
    break;
}

Example 4: switch case in js

var coll1="kjc;

switch(coll1)
{
  case "kjc":
    alert("youre special");
    break;
  case "horizon":
    alert("worst behaviour");
    break;
  case "cmr" :
    alert("worst character");
    break;
  default:
    alert("kjc is best");
    break;
}