Programming fundamentals through javascript
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The document provides an overview of JavaScript as a programming language used for web development, detailing its interaction with HTML and CSS. It covers basics of JavaScript programming including storage (variables, constants, arrays), conditional constructs, and iterations like loops. Additionally, it introduces different types of operators used in conditional checks and arithmetic computations.
Programming fundamentals through javascript
- 1. Programming in Java Script Java Script Programming Fundamentals
- 2. Java Script • Programming language of the web • Works in unison with HTML and CSS for web page • Code interpreted line by line by the javascript engine built within web browser
- 3. Different from HTML & CSS • HTML – Structure of web page • CSS – Layout and Design • Java Script – Behaviour/Interaction
- 4. Use of JS • Adds dynamic components • Helps interaction with user • Can be deferred loading – Increases site speed
- 5. How to write JS code • 2 ways of writing JS – External file – Embedded within HTML
- 6. Tags in HTML to embed JS <script language="javascript"> .....js code.... </script>
- 7. JS embedded within HTML <!DOCTYPE html> <html> <head> <title>Today's Date</title> <script> let date1 = new Date(); alert("Today's date is " + date1); </script> </head> <body> </body> </html>
- 8. Tags in HTML to link external JS <!DOCTYPE html> <html> <head> <title>Today's Date</title> <script src="myscript.js"> </script> </head> <body> <button type="button" onclick="firstFunction()">Check Today's Date</button> </body> </html>
- 9. External JS Code in myscript.js function firstFunction() { let date1 = new Date(); alert("Today's date is " + date1); }
- 10. Programming Fundamentals 3 Programming Basics
- 11. Program • Series of instructions • Input • Process • Output • Instruction is given for every function
- 12. Programming • Writing program in specific language • Logically putting the solution together • Breaking up solution into steps • Writing instructions for every step
- 13. 3 Programming Fundamentals • Storage • Conditional Constructs • Iteration
- 14. Storage • Save Data • Input Data – Data from user input • Processed Data – Data worked upon • Output Data – Message
- 15. Types of storage • Variable • Constants • Arrays
- 16. Variables • Named storage location in memory • Holds a single value • Value can change
- 17. Constants • Named storage location in memory • Holds a single value • Value cannot change once assigned
- 18. Arrays • Named storage location in memory • Holds single or multiple values • Value(s) can change • Single array can contain one or more elements • Each element has a value assigned to it • All the elements of an array need to store values of same data type • Eg: int array of 5 elements will store 5 individual values of integer type only. Cannot contain one integer, one float, one string or any mix of it.
- 19. Conditional Constructs • Applying Logic – Yes-> Do this – No-> Do that • Black or White • Zero or One • Binary • There is "No Grey Zone" – If it is not yes or no then its an Error
- 20. If-Elseif-Else Ladder • Check different options through permutations and combinations • Conditions depend on number of possible options • For checking different conditions use appropriate operators
- 21. If 1. IF MARKS>40 PRINT:"Pass" 2. IF CHOICE=="Hunger Games" PRINT:"Fiction"
- 22. If-else 1. IF MARKS>40 PRINT: "Pass" ELSE PRINT: "Fail" 2. IF CHOICE=="Hunger Games" PRINT: "Fiction" ELSE PRINT: "Comedy"
- 23. If-elseif-else 1. IF MARKS>40 PRINT: "Pass" ELSE IF MARKS==40 PRINT:"Just Pass" ELSE PRINT:"Fail" 2. IF CHOICE=="Hunger Games" PRINT: "Fiction" ELSE IF CHOICE=="Pride & Prejudice" PRINT: "Classic" ELSE PRINT: "Comedy"
- 24. Operators • Different conditions -> different operations – Logical operators – Arithmetic operators – Relational operators
- 25. Relational • To make a comparison while checking a condition, use relational operators. Operator Functionality Let’s consider x=5; y=10; > More Than x>y; False < Less Than x<y; True >= More Than or Equal To x>=y; False <= Less Than or Equal To x<=y; True == Equal to x==y; False != Not Equal to x!=y; True
- 26. Logical • To combine two or more situations of conditional checking use, logical operators. Operator Functionality Condition Example && Both the sides of operator should result true x<y && y!=x True x<y && y==x False || Either side of operator should result true x<y || y!=x True x<y || y!=x True ! Inverse the result x!<y False
- 27. Arithmetic • To compute arithmetic value we use Arithmetic Operators. Operator Functionality Condition Example + Addition x+y 15 - Subtraction x-y -5 * Multiplication x*y 50 / Division x/y 0 % Remainder x%y 5
- 28. Iteration • Repetition of instructions • Based on Logic • Continue till condition is fulfilled • Condition is not fulfilled-> stop processing & break loop • Move to line of code outside the loop boundary
- 29. Types of loops • For – Invariant check • While – Pre-condition check • Do-while – Post-condition check
- 30. For • Steps – Initialize – Condition – Process – Increment/Decrement BEGIN INITIALISE vitaminc=0 FOR (int vitaminc=0; vitaminc<10; vitaminc++) PRINT: "Vitamin C Added" END FOR PRINT: "Total amount of vitamin"+vitaminc END
- 31. While • Steps – Initialize – Condition – Process – Increment/decrement BEGIN INITIALISE choice="Orange" INITIALIZE vitaminc=0 WHILE (choice=="Orange") PRINT: "Vitamin C Added" vitaminc++ GET: choice END WHILE PRINT: "Total amount of vitamin"+vitaminc END
- 32. Do-While • Steps – Initialize – Process – Increment/Decrement – Condition BEGIN INITIALISE choice=" " INITIALISE vitaminc=0 DO PRINT: "Vitamin C Added" vitaminc++ GET: choice WHILE(choice=="Orange") PRINT: "Total amount of vitamin"+vitaminc END