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Episode 15 - Basics of Javascript
This document provides an overview and agenda for a session on JavaScript basics. It introduces concepts like hoisting, differences between var, let and const, arrow functions, recursion, arguments.callee, memoization, and promises. It also briefly discusses the history of JavaScript, from its creation in 1995 and renaming to JavaScript in 1996 to the introduction of EcmaScript to standardize the language. The agenda outlines explanations and demonstrations of these JavaScript fundamentals concepts.
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Episode 15 - Basics of Javascript
- 1. Path to Code BeginYour Salesforce Coding Adventure
- 2. Episode 15 Basics ofJavaScript
- 3. Jitendra Zaa Salesforce MVP SrTechnical Architect 23x Certified @Jitendra Zaa Speaker
- 4. Some House Rules •Please mute your mic • Keep adding questions in Zoom Q&A Window • No question is too small • Questions will be answered in last 15 mins
- 5. Agenda • Introduction toJavaScript • Hoisting • var vs let vs const • Different ways to write functions • Arrow Functions • Recursion • Arguments.Callee • Memoization • Promises
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- 7. 1995 • Mocha createdby Brendan Eich in 10 days • Renamed to LiveScript Officially • To piggyback popularity of Java, renamed to JavaScript • Worried about Java Trademark, Microsoft released its own version of JavaScript as JScript
- 8. 1996 • Worried aboutfuture and standardization , Ecma group was introduced to decide feature and capabilities of language • EcmaScript was trademarked by Ecma group to define the standard of JavaScript
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- 12. Hoisting The process ofassigning variable declarations a default value of undefined during the creation phase is called Hoisting.
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- 14. Var Var : function scoped undefinedwhen accessing a variable before it’s declared
- 15. let let : block scoped ReferenceErrorwhen accessing a variable before it’s declared
- 16. const const : block scoped ReferenceErrorwhen accessing a variable before it’s declared Can’t be reassigned
- 17. Demo 2 Different waysto write functions
- 18. Demo 3 Sequence ofMethod matters ?
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- 22. Arrow Function var multiplyES5= function(x, y) { return x * y; }; const multiplyES6 = (x, y) => { return x * y };
- 23. Memoization Memoization is programmingpractice in which returned results from functions are saved in cache, thus boosting the performance of long running / iterative methods.
- 24. Demo 6 Memoization andArrow Methods
- 25. Promises Are Asynchronous Has threestates 1. Pending 2. Fulfilled 3. Rejected
- 26. Reference • Secrets ofJavascript by John Resig • Hoisting • Arrow Functions
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- 28. Next Episode 16 GettingStarted with Lightning Web Components
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