Variables are containers that can hold practically any type of information in JavaScript. The language is so flexible that programmers can name and define as many unique containers as needed. This allows JavaScript programs to use a wide variety of data types that include numbers and letters. Learn how to create and use JavaScript variables in this introduction to variables and datatypes online video.
As soon as we write even the simplest program in any programming language, we…have to keep track of pieces of information.…If we are building a loan calculator, we need to keep track of the amount of the…loan, the number of months, the interest rate.…If we are writing a game program, we might need to know the current score, the…position of the player on the screen, how many lives do we have left, what…image do we use for our player. This is all data and we create variables to hold that data.…
Variables are simply containers.…What we're doing is going out to the computer memory and grabbing a little piece…of it, giving it a name to use while our program is running.…We grab this space and we name it and then we put a value in it, like an…email address or a date or a position or a number, and then we can change…that value as we need to.…Variables can vary, hence the name.…So in JavaScript you create a variable like this.…
The word var written all lowercase, which is part of the JavaScript language, and…
Author
Simon Allardice
Released
9/22/2011Finally, the course compares how code is written in several different languages, the libraries and frameworks that have grown around them, and the reasons to choose each one.
- Writing source code
- Understanding compiled and interpreted languages
- Requesting input
- Working with numbers, characters, strings, and operators
- Writing conditional code
- Making the code modular
- Writing loops
- Finding patterns in strings
- Working with arrays and collections
- Adopting a programming style
- Reading and writing to various locations
- Debugging
- Managing memory usage
- Learning about other languages
Skill Level Beginner
Duration
Views
Q: Using TextEdit with Mac OS 10.9 Mavericks?
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Introduction
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Welcome1m 13s
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1. Programming Basics
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What is programming?5m 45s
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Writing source code5m 34s
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2. Core Programming Syntax
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Why JavaScript?4m 45s
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Requesting input4m 50s
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3. Variables and Data Types
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Working with numbers5m 4s
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Working with operators4m 47s
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Properly using white space6m 46s
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4. Writing Conditional Code
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Setting comparison operators6m 59s
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5. Modular Code
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Breaking your code apart4m 1s
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Understanding variable scope2m 23s
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6. Iteration: Writing Loops
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Introduction to iteration4m 28s
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Writing a while statement5m 24s
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Creating a for loop3m 39s
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7. More About Strings
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8. Collections
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Working with arrays5m 46s
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Array behavior5m 29s
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9. Programming Style
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Programming style5m 55s
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Writing pseudocode4m 55s
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10. Input and Output
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Event driven programming7m 47s
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Introduction to file I/O6m 51s
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11. When Things Go Wrong
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Introduction to debugging5m 57s
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Understanding error messages3m 21s
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Using debuggers8m 2s
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12. Introduction to Object Orientation
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Using classes and objects6m 28s
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13. Advanced Topics
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14. Exploring the Languages
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Introduction to languages1m 42s
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C-based languages4m 40s
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The Java world3m 13s
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Ruby3m 4s
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Python2m 56s
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Objective-C4m 3s
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Libraries and frameworks3m 25s
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Conclusion
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Where to go from here1m 2s
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Video: Introduction to variables and data types