677Forcing a Boolean value in Javascript aka ‘The double negative trick’ 

return !!someValueThatisNotBooleanButShouldBe;

I first encountered it at Mark Pilgrim'sDive Into HTML5. Anyone else remembers his classic Kant Pro Generator from the olden days?

1073Javascript Images Sliders and Lightboxes
1053Creating & Displaying a Local Javacript-based Clock
986Displaying Text Data in a New Window
970Parsing Body JSON for quick inspection
964Gettting HTML Content from index.html into Vue
963General JS Variables in Vue
874CodeMirror – A Browser-based Text Editor