I'm pulling items out of the DOM with jQuery and want to set a property on an object using the id of the DOM element.   Example  const obj = {}  jQuery(itemsFromDom).each(function() {   const element = jQuery(this)   const name = element.attr(&...
Recently, I ran some of my JavaScript code through Crockford's JSLint, and it gave the following error:     Problem at line 1 character 1: Missing "use strict" statement.   Doing some searching, I realized that some people add "use...
I was recently comparing the current version of json2.js with the version I had in my project and noticed a difference in how the function expression was created and self executed.  The code used to wrap an anonymous function in parenthesis and the...
Summary  Can you explain the reasoning behind the syntax for encapsulated anonymous functions in JavaScript? Why does this work: (function(){})(); but this doesn't: function(){}();?    What I know  In JavaScript, one creates a named function li...
If I try to write  3.toFixed(5)   there is a syntax error. Using double dots, putting in a space, putting the three in parentheses or using bracket notation allows it to work properly.  3..toFixed(5) 3 .toFixed(5) (3).toFixed(5) 3["toFixed"...
var attr = ~'input,textarea'.indexOf( target.tagName.toLowerCase() )            ? 'value'            : 'innerHTML'   I saw it in an answer, and I've never seen it before.  What does it mean?...
Why do the code snippets below, taken from this article, produce different results due to only a single change in the placement of curly braces?  When the opening curly brace { is on a new line, test() returns undefined, and "no - it broke: und...
What is the preferred syntax for defining enums in JavaScript? Something like:  my.namespace.ColorEnum = {     RED : 0,     GREEN : 1,     BLUE : 2 }  // later on  if(currentColor == my.namespace.ColorEnum.RED) {    // whatever }   Or is there a mor...
I came across the following line  hsb.s = max != 0 ? 255 * delta / max : 0;   What do the ? and : mean in this context?...

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