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brightboost
2021-09-04 21:22:51 +02:00
parent 0189d40676
commit b89b9dfb3f
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chapter4/ch4.js
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// let rain = true;
// if(rain){
// console.log("** Taking my umbrella when I need to go outside **");
// } else {
// console.log("** I can leave my umbrella at home **");
// }
// if(expression) {
// // code associated with the if block
// // will only be executed if the expression is true
// } else {
// // code associated with the else block
// // we don't need an else block, it is optional
// // this code will only be executed if the expression is false
// }
let age = 16;
if(age < 18) {
console.log("We're very sorry, but you can't get in under 18");
} else {
console.log("Welcome!");
}
if(age < 3){
console.log("Access is free under three.");
} else if(age >=3 && age < 12) {
console.log("With the child discount, the access fee is 5 dollar");
} else if(age >=12 && age < 65) {
console.log("A regular ticket costs 10 dollar.");
} else if(age >= 65) {
console.log("A ticket is 7 dollars.");
}
if(age < 3){
console.log("Access is free under three.");
} else if(age < 12) {
console.log("With the child discount, the access fee is 5 dollar");
} else if(age < 65) {
console.log("A regular ticket costs 10 dollar.");
} else if(age >= 65) {
console.log("A ticket is 7 dollars.");
}
let access = age < 18 ? "denied" : "allowed";
console.log(access);
age < 18 ? console.log("denied") : console.log("allowed");
let activity = "Lunch";
if(activity === "Get up") {
console.log("It is 6:30AM");
} else if(activity === "Breakfast") {
console.log("It is 7:00AM");
} else if(activity === "Drive to work") {
console.log("It is 8:00AM");
} else if(activity === "Lunch") {
console.log("It is 12.00PM");
} else if(activity === "Drive home") {
console.log("It is 5:00PM")
} else if(activity === "Dinner") {
console.log("It is 6:30PM");
}
switch(expression) {
case value1:
// code to be executed
break;
case value2:
// code to be executed
break;
case value-n:
// code to be executed
break;
}
switch(activity) {
case "Get up":
console.log("It is 6:30AM");
break;
case "Breakfast":
console.log("It is 7:00AM");
break;
case "Drive to work":
console.log("It is 8:00AM");
break;
case "Lunch":
console.log("It is 12:00PM");
break;
case "Drive home":
console.log("It is 5:00AM");
break;
case "Dinner":
console.log("It is 6:30PM");
break;
}
switch(expression) {
case value1:
// code to be executed
break;
case value2:
// code to be executed
break;
case value-n:
// code to be executed
break;
default:
// code to be executed when no cases match
break;
}
if(false) {
// omitted to not make this unnecessarily long
} else {
console.log("I don't know this activity and cannot determine the current time.")
}
switch(activity) {
case "Get up":
console.log("It is 6:30AM");
break;
case "Breakfast":
console.log("It is 7:00AM");
break;
case "Drive to work":
console.log("It is 8:00AM");
break;
case "Lunch":
console.log("It is 12:00PM");
break;
case "Drive home":
console.log("It is 5:00AM");
break;
case "Dinner":
console.log("It is 6:30PM");
break;
default:
console.log("I cannot determine the current time.");
break;
}
let grade = "F";
switch(grade){
case "F":
case "D":
console.log("You've failed!");
break;
case "C":
case "B":
console.log("You've passed");
break;
case "A":
console.log("Nice!");
break;
default:
console.log("I don't know this grade.");
}
if(grade === "F" || grade === "D") {
console.log("You've failed!");
} else if(grade === "C" || grade === "B") {
console.log("You've passed");
} else if(grade === "A") {
console.log("Nice!");
} else {
console.log("I don't know this grade.");
}