singleVsDoubleQuotes.js

// I think the best way to show how the choice will influence what you do is in html
// Normally when writing HTML you would use double quotes for whatever classes/attributes you apply
// but here, in JS, we are starting the string with double quotes so we *must* use single quotes instead
var myElement = "<div class='class-something'></div>";

var myClass = "snd-nds";
// If you want to use a variable as the class name you need to use single quotes like we did before but then use
// concatenation to join it together
//                               **             **
var anotherElement = "<div class='" + myClass + "'></div>";

// The inverse will also work
var andAnotherOne = '<div class="' + myClass + '"></div>';