Revision For SDPF Topic 1 to 6
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This document summarizes key aspects of software development methodologies, programming languages, and JavaScript fundamentals. It covers the software development life cycle (SDLC) including planning, analysis, design, implementation, and maintenance. It also discusses rapid application development (RAD) and agile methodologies like Scrum. Integrated development environments (IDEs) are introduced along with text editors, compilers, and debuggers. JavaScript is defined and its differences from Java are outlined. JavaScript programs, methods, arguments, data types, variables, dialog boxes, and error handling techniques are summarized.
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Revision For SDPF Topic 1 to 6
- 1. Software Development and Programming Fundamentals (IT2033PA) Method of Software Development Life Cycle (SDLC) P Planning A D Analysis Design I Implementation An Organization’s total information system needs are identified, analyzed, prioritized and arranged. System requirements are studied and structured. The description of the recommended solution is converted into LOGICAL and PHYSICAL system specifications. The information system is coded, tested, installed and supported in the organization. An information system is systematically repaired and improved M Maintenance Rapid Application Development(RAD) It is an approach to develop information systems that promises better and cheaper systems and more rapid deployment by having systems developers and end users work together jointly in real time to develop systems. Increase speed and turbulence of doing business.(80s & 90s) Ready availability of high powered, computer based tools to support systems development and easy maintenance. Agile Methodology(Scrum Framework) It is an approach to systems analysis and design. It focus on a adaptive rather than predictive methodology. It also focus on people rather than roles and on self-adaptive processes. Scrum Framework It is lightweight, simple to understand and extremely difficult to master. It is a framework for developing and sustaining complex products. Scrum ensures the most valuable work has been completed when the project ends. Integrated Development Environment(IDE) Text Editor Edit plain text files. Complier Translates source code in programming language(JAVA) into another language that could be understood by the computer. Debugger Find errors(bugs). Test and debug other programmes.
- 2. JavaScript It is a popular general-purpose scripting language that allows a web page to interact with users and respond to events that occurs on the page. Difference with Java Java applications can be independent of a web page whereas JavaScript programs are embedded in a web page and must be run in a browser window. Java is a strongly typed language with strict guidelines, whereas JavaScript is a loosely typed and flexible. Java data must be declared whereas JavaScript do not have to be declared. JavaScript Programs are used to detect and react to user-initiated events such as a mouse going over a link or graphic . It can improve web sites with navigational aids, scrolling messages and rollovers, dialogue boxes, dynamic images and so forth. <head> <script type=”text/javascript”> document.write(“Hello World!”); </script> Method Argument </head> Debugging Load or compile time The most common errors will prevent the script from running at all. They are caused by syntax(e.g. misspelling or missing function) Runtime Errors that occur when the program actually starts running.(e.g. referenced a page that does not exists & placing in the wrong tag) Logical Harder to find as they imply that you misused an operator but your syntax was okay.
- 3. Data Numeric Data JavaScript supports both integers and floating-point numbers. String Data String Literals are rows of characters enclosed in “ or ‘ quotes. (e.g. 5+ 100 is 105 while “5”+100 is 5100) Boolean Data Logical values that have only true or false value. (a.k.a .yes or no/ on or off/ 1 or 0) Variables are containers that hold data such as numbers and strings.(Name/Type/Value) Dialog Boxes alert() prompt() confirm() Error Handling Syntax error Occurs when fail to recognize code.(Typo errors, missing brackets/semi-colon) Run-time error Can be caused by syntax error and it will not function till the error is not fixed. Logic error The execution of program statements and procedures are not correct. Tracing errors with window.alert method. Tracing errors withwrite()method. Using comments to locate bugs.