![]() How to manage errors and make your app communicate. How to use programming logic so your app does what you want it to. ![]() How to structure and group information in your app with data types. This course is designed to teach you the fundamentals of the JavaScript programming language and to give you lots of practice along the way! We'll look at: But how do you actually write apps? Where do you start? Apps rely on data and logic to make their magic happen, and that requires a programmer - you - to tell the computer what to do and how. reviewScore ) Ģ2.3 Numbers: Use Number for type casting and parseInt always with a radix for parsing strings.To create computer programs or build the app of your dreams, you need to know how to code in a programming language. toString ( ) // isn’t guaranteed to return a string // good const totalScore = String ( this. ![]() reviewScore + '' // invokes () // bad const totalScore = this. reviewScore ) // typeof totalScore is "object" not "string" // bad const totalScore = this. => this.reviewScore = 9 // bad const totalScore = new String ( this. 22.1 Perform type coercion at the beginning of the statement.See Translationġ.1 Primitives: When you access a primitive type you work directly on its value.Ĭonst numbers = // bad let sum = 0 for ( let num of numbers ) This guide is available in other languages too. It also assumes you are installing shims/polyfills in your app, with airbnb-browser-shims or the equivalent. Note: this guide assumes you are using Babel, and requires that you use babel-preset-airbnb or the equivalent. A mostly reasonable approach to JavaScript
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