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Map vs Object in JavaScript
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According to mozilla:
A Map object can iterate its elements in insertion order - a for..of loop will return an array of [key, value] for each iteration.
and
Objects are similar to Maps in that both let you set keys to values,
retrieve those values, delete ...
Textarea that can do syntax highlighting on the fly?
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It's not possible to achieve the required level of control over presentation in a regular textarea.
If you're OK with that, try CodeMirror or Ace (formerly skywriter and bespin), or Monaco (used in MS VSCode).
From the dupl...
Ajax, back button and DOM updates
If javascript modifies DOM in page A, user navigates to page B and then hits back button to get back to the page A. All modifications to DOM of page A are lost and user is presented with version that was originally retrieved from the server.
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Deleting an object in java?
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You should remove the references to it by assigning null or leaving the block where it was declared. After that, it will be automatically deleted by the garbage collector (not immediately, but eventually).
Example 1:
Object a = new Object();
a = null; // afte...
querySelector search immediate children
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Though it's not a full answer, you should keep an eye on the W3C Selector API v.2 which is already available in most browser, both desktop and mobile, except IE (Edge seems to support): see full support list.
function(elem) {
ret...
Difference between “read commited” and “repeatable read”
...nk the above isolation levels are so alike. Could someone please describe with some nice examples what the main difference is ?
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Maximum number of characters using keystrokes A, Ctrl+A, Ctrl+C and Ctrl+V
This is an interview question from google. I am not able to solve it by myself. Can somebody shed some light?
14 Answers
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Repairing Postgresql after upgrading to OSX 10.7 Lion
...n completely borked when trying to connect to the psql server. When I do it from the command line using
15 Answers
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How can I set focus on an element in an HTML form using JavaScript?
I have a web form with a text box in it. How do I go about setting focus to the text box by default?
9 Answers
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What's the best way to develop a sideswipe menu like the one in Facebook's new iOS app?
It appears that side-swipe menus are becoming a more common interface element as more information gets crammed into each iPhone app. Facebook has included it in their latest version and the new Gmail app appears to include it as well . I was wondering if anybody had thoughts on the most efficient...