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120 lines (86 loc) · 2.1 KB
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<!-- in this lesson: -->
<!-- ------------------- -->
<!--
Lesson 6 : Booleans
1. Comparison operators
2. Order of operation
3. If statement
-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Booleans & IF Statements</title>
<style>
</style>
</head>
<body>
<script>
true
false
// 🟨Comparison operators
// 🟦> < >= <= === !==
// 🟨Order of operation
// 🟦1. (...)
// 🟦2. * /
// 🟦3. + -
// 🟦4. Comparison operators
console.log(3 > 5 - 5);
console.log(5 === '5.00');
// 🟩
if (true) {
console.log('if');
}
else {
console.log('else');
}
// 🟩
const age = 15;
if (age >= 16) {
console.log('You can drive');
console.log('Congrats');
}
else if (age >= 14) {
console.log('Almost there');
}
else {
console.log("You can't drive");
}
// 🟩
console.log(true && false);
console.log(0.2 >= 0 && 0.2 < 1 / 3);
console.log(true || false);
console.log(!false);
// 🟩
if (0) {
console.log('truthy');
}
// 🟩
const cardQuantity = 5;
if (cardQuantity > 0) {
console.log('cart has products');
}
else {
console.log('cart is empty');
}
// 🟩
console.log(!0);
console.log('text' / 5);
// 🟩
const variable1 = undefined;
console.log(variable1);
// 🟩
const result = 0 ? 'truthy' : 'falsy';
console.log(result);
// 🟩
false && console.log('hello');
// 🟩
const message = 5 && 'hello';
console.log(message);
// 🟩
const currency = undefined || 'USD';
console.log(currency);
</script>
</body>
</html>