Java Script - Module I
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The document provides an overview of JavaScript, covering its significance in web and mobile development, as well as its applications in various platforms. Key topics include data types, flow control structures, functions, error handling, and the Document Object Model (DOM). The document also contains hands-on examples, interview questions, and recommendations for further reading.
![Closures
Here is a function to create an army of shooters:
function makeArmy() {
var shooters = []
for(var i=0; i<10; i++) {
var shooter = function() { // a shooter is a function
alert(i) // which should alert it's number
}
shooters.push(shooter)
}
return shooters
}
var army = makeArmy()](https://image.slidesharecdn.com/javascripti-160715065313/85/Java-Script-Module-I-10-320.jpg)
Java Script - Module I
- 2. Agenda Why JavaScript? Data Types Flow Control Structures Functions − Nested Functions − Recursion − Closures Error Handling Objects − Built-in Objects − User-defined Objects Document Object Model − DOM Level 1 − DOM Level 2 − DOM Level 3 Interview Questions Recommended Readings What’s Next? Hands On
- 3. Why JavaScript? "JavaScript is the only language that I’m aware of that people feel they don’t need to learn before they start using it." - Douglas Crockford
- 4. Why JavaScript? Web Development − Client-Side − Server-Side Mobile Applications Windows 8 Applications Chrome Extensions VR Games & Graphics Desktop Applications (Elektron)
- 5. Data Types Statements Expressions Variables − Hoisting Constants − Immutable Identifiers − Mutable Values Operators − Assignment − Increment, Weakly Typed − Type Coercion − Dynamic Typing Primitive Types − Booleans − Numbers − Strings − Null − Undefined − NaN − Symbols (ES6)
- 6. Flow Control Structures if if / else if / else if / else while do while for switch continue break
- 7. Functions (First-class_function) Nested Functions Recursion Closures Self Invoking Functions
- 8. Nested Functions Create a function sum that will work like that: sum(a)(b) = a+b. Yes, the syntax is dual brackets. Funny, isn’t it? For instance: sum(1)(2) = 3 Sum(5)(-1) = 4
- 9. Nested Functions Create a function sum that will work like that: sum(a)(b) = a+b and accepts any number of brackets. For instance: sum(1)(2) == 3 sum(5)(-1)(2) == 6 sum(6)(-1)(-2)(-3) == 0 Sum(0)(1)(2)(3)(4)(5)
- 10. Closures Here is a function to create an army of shooters: function makeArmy() { var shooters = [] for(var i=0; i<10; i++) { var shooter = function() { // a shooter is a function alert(i) // which should alert it's number } shooters.push(shooter) } return shooters } var army = makeArmy()
- 11. Error Handling try catch finally window.onerror
- 12. Objects Built-in Objects User-defined Objects − Function − JSON − Associative Array Pass by Value & Reference Prototype Chain
- 13. Built-in Objects Number String − getIndexOf − getLastIndexOf − search RegEx − match − exec − test Date − getTime / setTime
- 14. Objects Built-in Objects User-defined Objects − Function − JSON − Associative Array Pass by Value & Reference Prototype Chain
- 15. Objects Methods − is − hasOwnProperty − isPrototypeOf − toString − toSource − valueOf − apply − bind − Call Operators