![]() I recommend always declaring your variables with const by default, but with let if it is a variable that you need to mutate or reassign later.įunction myFunc ( x = 10 ) )Īs seen in the above sample, the Promise object takes an executor function which takes two parameters resolve and reject. ![]() Variables declared with const keyword can't be reassigned, while let and var can. In JavaScript, there are three keywords available to declare a variable, and each has its differences. Notions Variable declaration: var, const, let Calling static methods from non-static methods.Calling other static methods from a static method. With 64 bits we can represent 264 numbers which equal to 18 Quintilian. But sometimes, you would prefer to compare the values of their actual properties.
Write a function, deepEqual, that takes two values and returns true only if they are the same value or are objects with the same properties whose values are also equal when compared with a recursive call to deepEquala function deepEqual that takes two values and returns true only if they are the same value or are objects with the same properties, where the values of the properties are equal when compared with a recursive call to deepEqual. When you struggle to understand a notion, I suggest you look for answers on the following resources: These two objects are exactly the same, still JavaScript returns false. Exercise: Deep Comparison Exercise Description. You can find new features added by this update here it's very well done. Note: Most of the concepts introduced here are coming from a JavaScript language update (ES2015, often called ES6). This much anticipated and thoroughly revised third edition of Eloquent JavaScript dives deep into the JavaScript language to show you how to write beautiful, effective code. This guide is not intended to teach you JavaScript from the ground up, but to help developers with basic knowledge who may struggle to get familiar with modern codebases (or let's say to learn React for instance) because of the JavaScript concepts used.īesides, I will sometimes provide personal tips that may be debatable but will take care to mention that it's a personal recommendation when I do so. Though simple for beginners to pick up and play with, JavaScript is a flexible, complex language that you can use to build full-scale applications. This document is a cheatsheet for JavaScript you will frequently encounter in modern projects and most contemporary sample code. If you like this content, you can ping me or follow me on Twitter □
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