An Introduction to JavaScript

Let’s see what’s so special about JavaScript, what we can achieve with it, and which other technologies play well with it.

JavaScript was initially created to “make web pages alive”.

The programs in this language are called scripts. They can be written right in a web page’s HTML and run automatically as the page loads.

Scripts are provided and executed as plain text. They don’t need special preparation or compilation to run.

Today, JavaScript can execute not only in the browser, but also on the server, or actually on any device that has a special program called the JavaScript engine. The browser has an embedded JavaScript engine.

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sum(1)(2)(3)(4)..( n)() in JavaScript

console.log('sum(1)(2)(3)(4)..( n)()'); // Solution 1: let sum = function (a) { return function (b) { if (b) { return sum(a + b); } return a; } } let result = sum(1)(2)(3)(4)(5)(); console.log(result); // 15 // Solution 2: let sum = (a) => (b) => (b) ? sum(a+b) : a; let result = sum(1)(2)(3)(4)(5)(); console.log(result); // 15

Closures in JavaScript

A closure is the wrapping up of function and it's surrounding variables with in a function or lexical scope. In the other way we can say, we can access the outer function scope from the inner function. So we can say, closure are created when functions are created. Example of closure: function outerMethod() { var name = 'Hello World'; function innerMethod() { console.log(name); } innerMethod(); } outerMethod(); So output of the above example is: Hello World Here the name variable is in the scope of outer function and we are accessing from the inner function. This is closure. More understand about closure with it's lexical scoping: In JavaScript we can return a function within another function. Please check the below example. function outerMethod() { var name = 'Hello World'; ...

Angular Chart Builder

This is my first angular library, named angular-chart-builder . It's a license free npm library. Anyone can install and integrate this library to there own angular project. Now the angular-chart-builder library have two types of charts that is Progress Bar and Pie Chart . To get the library, please check the below url: https://www.npmjs.com/package/angular-chart-builder

Parameswar Mondal

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