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Nalezeno "JavaScript": 798

JavaScript Proxy


I’ve always loved the flexibility of Objects and prototypes in JavaScript, but for a long time, I felt that a level of dynamism was lacking. JavaScript eventually added get and set methods for object properties, which was an awesome step, but there was still room for improvement....

Social Cards as a Service


I love the idea of programmatically generated images. That power is close at hand these days for us front-end developers, thanks to the concept of headless browsers. Take Puppeteer, the library for controlling headless Chrome. Generating images from URLs is their default use case: const puppeteer...

7 JavaScript Playgrounds to Use in 2019


The importance of online code editing platforms cannot be overemphasized. As much as we love our local IDE's, one too many times we find ourselves needing to quickly share and or collaborate with

JavaScript Glossary: String concat()


Basics This method is used to join the calling string and the provided string arguments. It returns a new String object containing the calling string and the provided arguments . If no arg

JavaScript Glossary: Array unshift() Method


Basics The unshift array method appends a number of values to the start of a given array. It then returns the new length of the array. This method can take a number of argumen

The #StateOfCSS 2019 Survey


You know about the State of JavaScript survey, where thousands upon thousands of developers were surveyed about all-things-JS, from frameworks to testing and many other things in between? Well, Sacha Greif has launched one focused entirely on CSS. This is super timely given a lot of the content...

​​Avoiding those dang cannot read property of undefined errors


​​​​Uncaught TypeError: Cannot read property 'foo' of undefined.​ The dreaded error we all hit at some point in JavaScript development. Could be an empty state from an API that returns differently than you expected. Could be something else. We don’t know because the error itself is so general...

A Funny Thing Happened on the Way to the JavaScript


Around this time last year, I wrote an article about the JavaScript learning landscape. Within that article, you’ll find my grand plans to learn JavaScript — complete with a link to a CodePen Collection I started for tracking my progress, and it even got dozens of comments cheering me on. Like most...

JavaScript Glossary: Array .splice() Method


Basics The splice array method changes an existing array by removing, adding and/or replacing specified elements from it. The method mutates the array and returns an array of

JavaScript Glossary: Array .slice() Method


Basics The slice array method copies a given part of an array returning the selected part as an array. It doesn’t mutate the given array rather, it returns a new array

JavaScript Glossary: Array .reverse() Method


Basics This method changes the position of elements within the array. The first element goes to the last position and the last element goes to the first position. The method returns the re

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