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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

​​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...

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

JavaScript Glossary: Array .map() Method


Basics The map() method takes a callback method that performs an operation on the elements in the array. It returns a new array containing the resulting values of running the

Don’t just copy the @font-face out of Google Fonts URLs


I don't think this is an epidemic or anything, but I've seen it done a few times and even advocated for. This is what I mean... You go to Google Fonts and pick a font like Open Sans, and it gives you either a <link> or an @import with a URL there in which to ready this font for usage...

Pokémon's First Japanese Theme Song Returns


When the original Pokémon TV anime debuted in Japan on September 8, 1998, the theme song was “Mezase Pokémon Masutaa” or “Aim to be a Pokémon Master.” Now in 2017, the theme is back!Read more

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