reading-notes

Class 7 - Programming with JavaScript

Lab 7 - Programming with JavaScript

Requirements

1. Use functions to improve the clarity and readability of your code.
2. Wrap related steps into a single function. Be sure you are properly defining the function, calling it, and getting the return value you expect.
3. Can you see how you might use just a single <script> tag with a src attribute to access your JS, and then specific function calls throughout the rest of your page?
4. Add a check to the user input you are getting, to see if the initial user input is an acceptable value. If not, present the user with an error message and a second chance to enter a proper value.

Written Class Notes

• function askName (){} let userName = prompt () console.log(userName) in HTML use <script> askName()</script> This last part is invoking in HTML
• Whatever declared in one function only exists within that function. Add return (function name) and assign the function with let at the beginning.
• function name (parameter){logic}

Read 7 - Programming with JavaScript Reflection and Discussion

Resources Link/Pages

1. MDN Control Flow
2. Functions
   • They are blocks of code that do specific tasks
   • Invoke: Executes code inside function
   • return: function stops executing
3. Operators
   • Types of operators: Arithmetic Operators, Assignment Operators, Comparison Operators, String Operators, Logical Operators, Bitwise Operators, Ternary Operators, Type Operators - Arithmetic perform arithmetic on numnbers (+, -, *, /) - Assignment adds value to variable (+=) - Comparison (==, ===, !=) - Adding a number and a string will return a string and combine two value together (4+’2’=’42’)
4. Expressions and Operators
5. Functions

Answer

1. What is control flow?
   • The order in which computer execute a script, looking from start to finish but also how the script structure is as it can affect order of execution.
2. What is a JavaScript function?
   • Blocks of code that do specific tasks
3. What does it mean to invoke - or call - a function?
   • Calling the function will tell the code inside the function when to execute it.
4. What are the parenthesis () for when you define a function?
   • Its to specify the parameters that the function accepts