11. Iterators | ES6 | JavaScript | TypeScript
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This document discusses iterators in ES6. It explains that an object is considered iterable if it has a Symbol.iterator property implementation. Arrays, Maps, and Sets have built-in iterator implementations, while objects do not by default. The document provides examples of using for-of loops to iterate over arrays, sets, and customizes an object to be iterable by implementing Symbol.iterator.
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![Iterator on Array
An array has its own iterator function implementation.
Example
var arr_one = [ 1, 2, 3, 4, 5 ];
for ( let element of arr_one){
console.log ( arr_one [ element ] );
}](https://image.slidesharecdn.com/11-170916115739/85/11-Iterators-ES6-JavaScript-TypeScript-4-320.jpg)
![Iterator on Set
An set has its own iterator function implementation.
Example
var set_one = ( [ 1, 2, 3, 4, 5 ] );
for ( let element of set_one){
console.log ( set_one [ element ] );
}](https://image.slidesharecdn.com/11-170916115739/85/11-Iterators-ES6-JavaScript-TypeScript-5-320.jpg)
![Iterator on Object (cont…)
Custom Iterator
obj [ Symbol.iterator ] = function( ) {
let keys = Object.keys (obj), count = 0, isDone = false;
let next = ( ) => {
if ( count >= keys.length ) { isDone = true }
return { done : isDone, value : obj [ keys [ count++ ] ] };
} return { next };
}](https://image.slidesharecdn.com/11-170916115739/85/11-Iterators-ES6-JavaScript-TypeScript-7-320.jpg)
![Iterator on Object (cont…)
Custom Iterator
for ( let property of obj ) {
console.log ( obj [ property ] );
}
// PJ, SSE](https://image.slidesharecdn.com/11-170916115739/85/11-Iterators-ES6-JavaScript-TypeScript-8-320.jpg)
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7. Rest parameters | ES6 | JavaScriptpcnmtutorials The document discusses rest parameters in ES6, which allow a function to accept an indefinite number of arguments as an array. It explains that rest parameters must be the last part of a function's parameters and are prefixed with three dots. The document compares rest parameters to the arguments object, noting rest parameters can be iterated over like arrays but arguments cannot. It also demonstrates how rest parameters can be destructured to assign array elements to distinct variables in the function body.
6. Default parameters | ES6 | JavaScript
6. Default parameters | ES6 | JavaScriptpcnmtutorials Default function parameters allow parameters to be initialized with default values if no value is passed when calling the function. Default parameters can be destructured and the default values can be functions that are evaluated at call time. An example shows a function that returns an employee ID with a default value if no ID is passed, and another function that returns a full name using default first and last name values if not passed.
5. Destructuring | ES6 | Assignment 
5. Destructuring | ES6 | Assignment pcnmtutorials Destructuring is an expression. It makes possible to unpack values from arrays, objects, function response, variable declarations.
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4. Template strings | ES6pcnmtutorials Template strings are string literals that allow for embedded expressions and support both single and multiline strings. They are enclosed in backticks and allow expressions indicated by a dollar sign and curly braces. The document provides the syntax for template strings and examples of single line, multiline, and expressions used in template strings.
3. Object literals | ES6 | JSON
3. Object literals | ES6 | JSONpcnmtutorials An object literal is a list of zero or more params of property names and associated values enclosed in curly braces ( { } ). An object literal is super set of json object. The values may be number, string, object, expression, function response, etc.
2. Classes | Object Oriented Programming in JavaScript | ES6 | JavaScript
2. Classes | Object Oriented Programming in JavaScript | ES6 | JavaScriptpcnmtutorials A class is a template / blue print is used to create an object. In JavaScript class is a special kind of function. In JavaScript there are two ways to create class one is the class declaration and the second one is class expressions.
1. Arrow Functions | JavaScript | ES6
1. Arrow Functions | JavaScript | ES6pcnmtutorials Arrow function expressions are new functions available in ES6. Using arrow function expressions we can reduce function coding. In Arrow function expressions there is no this inside arrow function. if you call this it will take immediate parent's context.
Decorators | TypeScript | Angular2 Decorators
Decorators | TypeScript | Angular2 Decoratorspcnmtutorials Decorator is a special declaration in TypeScript. Decorators can able to apply to class, method, accessor, property and parameter declarations.
Web workers | JavaScript | HTML API
Web workers | JavaScript | HTML APIpcnmtutorials Web workers are scripts which are runs in background without interrupting UI threads. Web workers communication happening through event messaging concept.
Declaration merging | Typescript
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Module resolution | Typescript
Module resolution | Typescriptpcnmtutorials This Presentation describes in details about module resolution concept in typescript. Based on this presentation you will know how compiler handling the modules concept.
Material design in android L developer Preview
Material design in android L developer Previewpcnmtutorials Material Design in Android provides guidelines for visual, motion, and interactive designs across platforms and devices. The Android L Developer Preview introduces new components and features related to material design like a new material theme, widgets for complex views, and APIs for custom shadows and animations. Key elements of material design in Android apps include color palettes, touch feedback animations, activity transitions, and use of the RecyclerView and CardView widgets which support material design out of the box.
data structure, stack, stack data structure
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1.introduction to data_structures
1.introduction to data_structurespcnmtutorials This document discusses different types of data structures, including linear and non-linear structures. Linear structures like arrays, stacks, queues, and linked lists store data in a linear order. Stacks follow LIFO while queues follow FIFO. Non-linear structures like trees and graphs store data in a non-linear fashion. Trees have a root node, child nodes, and terminal nodes. Graphs are sets of nodes connected by edges that can form connected or non-connected graphs.
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- 1. Iterators | ES6 JAGADEESH PATTA ( PJ )
- 2. Agenda Introduction Iterators Iterator on Array Iterator on Set Iterator on Object Live Examples
- 3. Introduction An object is consider like an iterable when it has an implementation for Symbol.iterator property. When an object contains Symbol.iterator implementation than the object allows us to use in for…of on it. Array, Map, Set and String have their Symbol.iterator property already implemented.
- 4. Iterator on Array An array has its own iterator function implementation. Example var arr_one = [ 1, 2, 3, 4, 5 ]; for ( let element of arr_one){ console.log ( arr_one [ element ] ); }
- 5. Iterator on Set An set has its own iterator function implementation. Example var set_one = ( [ 1, 2, 3, 4, 5 ] ); for ( let element of set_one){ console.log ( set_one [ element ] ); }
- 6. Iterator on Object An object doesn’t have its own iterator function implementation. If we want to apply for…of on object we need to implement Symbol.iterator. Example var obj = { “name” : “PJ”, “designation” : “SSE” }
- 7. Iterator on Object (cont…) Custom Iterator obj [ Symbol.iterator ] = function( ) { let keys = Object.keys (obj), count = 0, isDone = false; let next = ( ) => { if ( count >= keys.length ) { isDone = true } return { done : isDone, value : obj [ keys [ count++ ] ] }; } return { next }; }
- 8. Iterator on Object (cont…) Custom Iterator for ( let property of obj ) { console.log ( obj [ property ] ); } // PJ, SSE
- 9. Any Q ?
- 10. Thank You