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javascript Programming Glossary: checksWhy was the arguments.callee.caller property deprecated in JavaScript? http://stackoverflow.com/questions/103598/why-was-the-arguments-callee-caller-property-deprecated-in-javascript tracing etc but even the best code is sub optimal due to checks that would not otherwise be necessary . The other major issue.. the point that the call is made it needs to either insert checks for all the arguments before the inlined code or it cannot inline.. case a smart interpreter should be able to rearrange the checks to be more optimal and not check any values that would not be..
How to detect if a variable is an array http://stackoverflow.com/questions/1058427/how-to-detect-if-a-variable-is-an-array named 0 instead which can be done via one of these checks typeof obj 0 'undefined' false negative for `obj 0 undefined`.. like primitives ie strings . Here's the code for robust checks for JS arrays function isArray obj return Object.prototype.toString.call..
Memory leak risk in JavaScript closures http://stackoverflow.com/questions/11186750/memory-leak-risk-in-javascript-closures function callback.apply xhr return function data do some checks on data before sending data.hasOwnProperty 'user' etc... xhr.send..
Choosing and activating the right controls on an AJAX-driven site http://stackoverflow.com/questions/15048223/choosing-and-activating-the-right-controls-on-an-ajax-driven-site automatically picks my shoe size adds it to the cart and checks out for me. I am currently trying to use this script below but..
What is the 'new' keyword in JavaScript? http://stackoverflow.com/questions/1646698/what-is-the-new-keyword-in-javascript obj1 doesn't have a property called 'b' so JavaScript checks its prototype . Its prototype is the same as ObjMaker.prototype..
How can I merge properties of two JavaScript objects dynamically? http://stackoverflow.com/questions/171251/how-can-i-merge-properties-of-two-javascript-objects-dynamically all over your prototypes then you have to get fancier with checks like hasOwnProperty but that code will work for 99 of cases...
How to fix Array indexOf() in JavaScript for IE browsers http://stackoverflow.com/questions/1744310/how-to-fix-array-indexof-in-javascript-for-ie-browsers I wrap it on all my pages with the following check which checks if the prototype function exists and if not go ahead and extend..
What does this construct (x = x || y) mean? http://stackoverflow.com/questions/2802055/what-does-this-construct-x-x-y-mean boolean evaluation so var title title Error basically checks if title evaluates to false . If it does it returns Error otherwise..
How to print a number with commas as thousands separators in JavaScript http://stackoverflow.com/questions/2901102/how-to-print-a-number-with-commas-as-thousands-separators-in-javascript a multiple of 3 digits 567 etc. . The negative assertion checks that the multiple of 3 digits does not have any digits after..
http://stackoverflow.com/questions/3219758/detect-changes-in-the-dom document.onpropertychange callback else fallback naive checks a particular event function test event el.addEventListener event..
What is console.log and how do I use it? [duplicate] http://stackoverflow.com/questions/4743730/what-is-console-log-and-how-do-i-use-it alone if window.console window.console log function This checks to see if the console is present and if not it sets it to an..
How to parse JSON in JavaScript http://stackoverflow.com/questions/4935632/how-to-parse-json-in-javascript browsers. ‚However this performs additional unnecessary checks that are also performed by JSON.parse so for the best all round.. immediately rather than having jQuery perform sanity checks on the string before passing it to the native parsing function...
Change the selected value of a drop-down list with jQuery http://stackoverflow.com/questions/499405/change-the-selected-value-of-a-drop-down-list-with-jquery this question jQuery's documentation states jQuery.val checks or selects all the radio buttons checkboxes and select options..
How to load up CSS files using Javascript? http://stackoverflow.com/questions/574944/how-to-load-up-css-files-using-javascript link.media 'all' head.appendChild link This example checks if the CSS was already added so it adds it only once. Put that..
How does JavaScript handle AJAX responses in the background? http://stackoverflow.com/questions/7575589/how-does-javascript-handle-ajax-responses-in-the-background Each time a javascript thread of execution finishes it checks to see if there is another event in the queue to process. If..
Why Javascript only works after opening developer tools in IE once? http://stackoverflow.com/questions/7742781/why-javascript-only-works-after-opening-developer-tools-in-ie-once them in an if statement or some other conditional which checks whether the console object exists before trying to call it...
For each in an array. How to do that in JavaScript? http://stackoverflow.com/questions/9329446/for-each-in-an-array-how-to-do-that-in-javascript 4294967294 away below console.log a key Note the two checks That the object has its own property by that name not one it..
Authentication in RESTful web services http://stackoverflow.com/questions/13186455/authentication-in-restful-web-services read the data in transit and the server does the following Checks that the application key is valid. Validates that the username..
User recognition without cookies or local storage http://stackoverflow.com/questions/15966812/user-recognition-without-cookies-or-local-storage Calculates teste Y result results w . i column_value i Checks in each class the test fits return result 0 true false END test_class..
What is the instanceof operator in JavaScript? http://stackoverflow.com/questions/2449254/what-is-the-instanceof-operator-in-javascript the actual constructor of a class. The basic definition is Checks the current object and returns true if the object is of the..
http://stackoverflow.com/questions/3744270/dynamically-loading-css 'complete' fileref.readyState 'loaded' readyfunc else Checks if the stylesheet has been loaded every 50 ms for others setTimeout..
Follow all users on a twitter page [closed] http://stackoverflow.com/questions/5841118/follow-all-users-on-a-twitter-page __cnt__ 500 What it does Looks in the main column .stream Checks that you aren't already following or pending display block check..
remove item from json array using its name / value http://stackoverflow.com/questions/6310623/remove-item-from-json-array-using-its-name-value property value Remove from array array.splice index 1 Checks countries.result for an object with a property of 'id' whose..
How to bind to all custom events in jQuery http://stackoverflow.com/questions/9735608/how-to-bind-to-all-custom-events-in-jquery For instance .each boundEvents function if this.indexOf Checks each event name for an asterisk alert this alerts the namespace..
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