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Variables-and-Operators-Task #20

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451c7d8
Changed the Variables and solved the needed tasks
JaeMaaroufi Feb 7, 2024
ab4e2b3
I finished the 4th task
JaeMaaroufi Feb 8, 2024
7bcb5cd
Merge branch 'TheCodePeople:main' into main
JaeMaaroufi Feb 8, 2024
7402a23
Finished the 4 tasks regarding Arthmetic and logical Operators
JaeMaaroufi Feb 8, 2024
36df0f1
Merge branch 'main' of github.com:JaeMaaroufi/Variables-and-Operators…
JaeMaaroufi Feb 8, 2024
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29 changes: 29 additions & 0 deletions arthimetic-operators.js
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,20 @@ Task 1:
7. Use console.log() to print the value of variable e to the console. (it should result 102.000)
*******************************************************************************/
// TODO: ADD YOUR CODE BELOW
let a = (4 + 6)
console.log(a)

let b = (10 * 5)
console.log(b)

let c = (17 % 3)
console.log(c)

let d = (b - a)
console.log(d)

let e = (a + b + c + d)
console.log(e)
/*******************************************************************************
Task 2:
1. Subtract two numbers and log the result to the console.
Expand All @@ -28,3 +41,19 @@ Task 1:
5. Divide two numbers and round the result to the nearest integer before logging it to the console.
*******************************************************************************/
// TODO: ADD YOUR CODE BELOW
let subtraction = (10 - 10)
console.log(subtraction)

let multiplication = (3 * 1 * 5 * 7)
console.log(multiplication)

let volumeOfRectangularPrism = (3 * 5 * 7)
console.log(volumeOfRectangularPrism)

let price = 9.99
let discount = 0.20
let discountedPrice = (price - discount)
console.log(discountedPrice.toFixed(3))

let division = (120/20)
console.log(division.toFixed(3))
18 changes: 10 additions & 8 deletions index.html
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@@ -1,14 +1,16 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Variables and Operators</title>
</head>
<body>
<script src="./variables.js"></script>
</head>
<body>
<!-- <script src="./variables.js"></script> -->
<!-- <script src="./arthimetic-operators.js"></script> -->
<script src="./logical-comaprison-operators.js"></script>
<!-- <script src="./arthimetic-operators.js"></script> -->
<!-- <script src="./logical-comaprison-operators.js"></script> -->
</body>
</body>
</html>
51 changes: 26 additions & 25 deletions logical-comaprison-operators.js
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Expand Up @@ -6,35 +6,35 @@ TASK 1:
// Have fun! // 😃
********************************************************************************/

const exp1 = 10 >= 10; // TODO: ADD YOUR EVALUATION HERE -->
const exp1 = 10 >= 10; // TODO: ADD YOUR EVALUATION HERE --> true

const exp2 = "dog" == "dog"; // TODO: ADD YOUR EVALUATION HERE -->
const exp2 = "dog" == "dog"; // TODO: ADD YOUR EVALUATION HERE --> true

const exp3 = true != false; // TODO: ADD YOUR EVALUATION HERE -->
const exp3 = true != false; // TODO: ADD YOUR EVALUATION HERE --> false
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@AlhassanAli01 AlhassanAli01 Feb 9, 2024

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This should return true instead


const exp4 = "10" === 10; // TODO: ADD YOUR EVALUATION HERE -->
const exp4 = "10" === 10; // TODO: ADD YOUR EVALUATION HERE --> false

const exp5 = 5 > 4; // TODO: ADD YOUR EVALUATION HERE -->
const exp5 = 5 > 4; // TODO: ADD YOUR EVALUATION HERE --> true

const exp6 = null == undefined; // TODO: ADD YOUR EVALUATION HERE -->
const exp6 = null == undefined; // TODO: ADD YOUR EVALUATION HERE --> false
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@AlhassanAli01 AlhassanAli01 Feb 9, 2024

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This should return true, because both of these values are falsey values by default, meaning that false == false.

This would return false only when using the strict equals operator === which would also check for the types resulting in them being false.


const exp7 = "true" == true; // TODO: ADD YOUR EVALUATION HERE -->
const exp7 = "true" == true; // TODO: ADD YOUR EVALUATION HERE --> false

const exp8 = "false" == false; // TODO: ADD YOUR EVALUATION HERE -->
const exp8 = "false" == false; // TODO: ADD YOUR EVALUATION HERE --> false

const exp9 = NaN === NaN; // TODO: ADD YOUR EVALUATION HERE -->
const exp9 = NaN === NaN; // TODO: ADD YOUR EVALUATION HERE --> true
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@AlhassanAli01 AlhassanAli01 Feb 9, 2024 •
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This should evaluate to false.
The reason NaN === NaN evaluates to false is because according to the IEEE 754 standard (which JavaScript follows for floating-point arithmetic), NaN values are considered unordered. This means that they are not equal to any other value, including other NaN values.


const exp10 = !false || false; // TODO: ADD YOUR EVALUATION HERE -->
const exp10 = !false || false; // TODO: ADD YOUR EVALUATION HERE --> true

const exp11 = false && !false; // TODO: ADD YOUR EVALUATION HERE -->
const exp11 = false && !false; // TODO: ADD YOUR EVALUATION HERE --> false

const exp12 = "apple" > "pineapple"; // TODO: ADD YOUR EVALUATION HERE -->
const exp12 = "apple" > "pineapple"; // TODO: ADD YOUR EVALUATION HERE --> apple
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@AlhassanAli01 AlhassanAli01 Feb 9, 2024

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In the expression "apple" > "pineapple", JavaScript compares the strings character by character from left to right. Since "a" comes before "p" in the alphabet, "apple" is considered "less than" "pineapple". Therefore, "apple" > "pineapple" evaluates to false.


const exp13 = "2" > "12"; // TODO: ADD YOUR EVALUATION HERE -->
const exp13 = "2" > "12"; // TODO: ADD YOUR EVALUATION HERE --> false
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@AlhassanAli01 AlhassanAli01 Feb 9, 2024

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This should evaluate to true.
Even though numerically 2 is less than 12, since we're comparing strings, the comparison is based on their lexicographical order. In this case, the string "2" is considered greater than the string "12" because "2" comes after "1" lexicographically.


const exp14 = undefined == null; // TODO: ADD YOUR EVALUATION HERE -->
const exp14 = undefined == null; // TODO: ADD YOUR EVALUATION HERE --> false
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@AlhassanAli01 AlhassanAli01 Feb 9, 2024

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This should evaluate to true.
Both null & undefined are falsey values, and because we're using == we're basically saying false == false which should evaluate to true.
If we were using === it should indeed be false since we're comparing values and types as well.


const exp15 = undefined === null; // TODO: ADD YOUR EVALUATION HERE -->
const exp15 = undefined === null; // TODO: ADD YOUR EVALUATION HERE --> false

/*******************************************************************************
Task 2:
Expand All @@ -47,33 +47,34 @@ const isHappy = false;

// - Check if num is between 10 and 20 (inclusive) using the logical AND operator. Log the result to the console.
// TODO: ADD YOUR CODE BELOW

console.log(num >= 10 && num <= 20);
// - Check if num is either less than 5 or greater than 50 using the logical OR operator. Log the result to the console.
// TODO: ADD YOUR CODE BELOW

console.log(num < 5 || num >50)
// - Check if str is either "apple" or "orange" using the logical OR operator. Log the result to the console.
// TODO: ADD YOUR CODE BELOW

console.log(str == "apple" || str == "orange")
// - Check if isHappy value is true using the logical NOT operator. Log the result to the console.
// TODO: ADD YOUR CODE BELOW

console.log(!isHappy)
// - Check if num is even and greater than 10 using the logical AND operator. Log the result to the console.
// TODO: ADD YOUR CODE BELOW

console.log(num == 10 && num >10)
// - Check if num is divisible by both 3 and 5 using the logical OR operator. Log the result to the console.
// TODO: ADD YOUR CODE BELOW

console.log(num/3 || num/5)
// - Check if str contains the letter "e". Log the result to the console.
// TODO: ADD YOUR CODE BELOW

console.log(str.includes("e"))
// - Check if str starts with "Hakuna". Log the result to the console.
// TODO: ADD YOUR CODE BELOW

console.log(str.startsWith("Hakuna"))
// - Check if str ends with "a". Log the result to the console.
// TODO: ADD YOUR CODE BELOW

console.log(str.endsWith("a"))
// - Check if num is either negative or odd using the logical OR operator. Log the result to the console.
// TODO: ADD YOUR CODE BELOW

console.log(num == "negative"|| num == "odd")
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@AlhassanAli01 AlhassanAli01 Feb 9, 2024 •
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To check if the number is negative correctly:
num < 0
To check if the number is odd we use the mod operator:
num % 2 !== 0
or
num % 2 === 1

// - Check if the length of str is greater than num or equal to 40 using logical OR operator. Log the result to the console.
// TODO: ADD YOUR CODE BELOW
console.log(str.length > num || str.length == 40)