Comp sci basics

Introduction to Coding Skills Development

• The development of coding skills follows a structured approach in the code.org curriculum:

  • Introduction of the concept

  • Presentation of how the concept looks in code

  • Practice and debugging

  • Creation

Understanding Code Development

• Emphasis on modifying existing code rather than starting from scratch

• Importance of repurposing previously encountered content

• Creating from scratch is occasionally necessary but not the norm

Structure of the Curriculum

• Each topic typically spans about four periods, with adjustments made as necessary:

  • Introduction of unit three was less formally checked; focus shifts to ensuring students engage with the material

  • From unit four onward, small credits will contribute to the project grade to encourage ongoing engagement

  • Avoid cramming information and wasting flexible time

Accountability and Class Structure

• Students will be responsible for managing their learning pace

• Regular checks for understanding will be conducted during class, with emphasis on troubleshooting

• Teaching philosophy centers around prompting student thought rather than providing answers

• Utilization of ancient Greek philosophy (Socratic method) for the learning process

Topic Introduction: Variables

• Definition of variables in coding contrasted with their mathematical counterpart

  • In math, variables serve as placeholders for unknowns

  • In coding, variables are actual storage locations in memory, storing values (e.g., a = 3 represents a storage space named 'a' that holds the number 3)

Types of Variables

• The following types of variables will be focused on during the course:

  1. Numeric:

     • Example: let a = 3;

  2. String:

     • Strings can contain letters, numbers, punctuation, etc., and are denoted by quotation marks (e.g., let greeting = "Hello";)

  3. Boolean:

     • Holds either a true or false value, important for logical operations (e.g., let isActive = true;)

     • Related to binary systems (0 or 1) as it provides two possible outcomes

Setting Up Variables in Code

JavaScript Syntax

• Declaring a variable in JavaScript:

  • Example of variable declaration:

    • var num1; to reserve storage space

    • Setting a value: num1 = 3;

    • Distinction between assignment in coding vs. equality in math

• Example of defining a string:

  • var day = "Monday";

    • Importance of quotation marks for strings

Variable Operations and Assignments

• Assignment statements are used to assign values to variables:

  • num1 = num1 + 2; changes the value stored in num1 from 3 to 5

• Explanation of why this is not an equation: it modifies the stored value rather than presenting equality

Combining Strings: Concatenation

• Process of combining strings:

  • Example:

    • var dayName = day + "day"; yields "Monday"

  • This operation is known as concatenation

Limitations and Rules of Variable Naming

• Certain limitations in variable naming include:

  • Avoiding starting variable names with punctuation marks or spaces

• Assignment statement:

  • Clarifies the action of putting a value into a storage location

Arithmetic Operations Overview

• Overview of arithmetic operators used in coding:

  • Addition: +

  • Subtraction: -

  • Multiplication: *

  • Division: /

  • Exponentiation: ^ (caret symbol)

  • Modulus: % (gives remainder after division)

Further Considerations in Coding

• Importance of using parentheses to maintain order of operations

• The necessity of clear entry to avoid errors in calculations

Conclusion of Initial Coding Session

• Initial understanding of coding concepts begins with variables and their operations

• Students are encouraged to refer to provided materials and practice coding with guidance on structuring their work during class rather than at home

• Future lessons will build on fundamental concepts introduced here, particularly in relation to logic and variable interactions.