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What is a plain English explanation of “Big O” notation?
... then initials or first name, possibly address and then telephone numbers.
Now if you were instructing a computer to look up the phone number for "John Smith" in a telephone book that contains 1,000,000 names, what would you do? Ignoring the fact that you could guess how far in the S's started (let...
What is the difference between JSON and Object Literal Notation?
...literals, number literals or identifier names as keys (since ES6, keys can now also be computed, which introduces yet another syntax).
The values can be any valid JavaScript expression, including function definitions and undefined.
Duplicate keys produce defined, specified results (in loose mode, th...
Convert boolean result into number/integer
...
Interestingly, the ternary is now fastest in Chrome 64.0.3282 on macOS 10.13.3.
– 2540625
Feb 13 '18 at 23:49
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Find out whether radio button is checked with JQuery?
...) alert('is checked');
alert('check-checky-check was changed');
});
Now when you programmatically change the state, you have to trigger this event also:
$('#radio_button').attr("checked", "checked");
$('#radio_button').click();
...
How to test if parameters exist in rails
...I, but I'm sure that's safe enough. I've been calling params.to_h.key? for now.
– stephen.hanson
Nov 9 '16 at 19:38
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Canvas width and height in HTML5
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Thx much appreciated. I see now what CSS is doing... it treats the canvas 'like' a image, scaling an image is obviously not as good as 're-drawing' it!
– EnglishAdam
Sep 11 '14 at 18:32
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JSON Array iteration in Android/Java
...of JSONArray iterable, meaning that the for (Object foo : bar) syntax will now work with it (note that foo has to be an Object, because JSONArrays do not have a declared type). All this works because the JSONArray class is backed by a simple ArrayList, which is already iterable. I imagine that other...
Difference between Role and GrantedAuthority in Spring Security
...s added, a profile is assigned to it (having all permissible permissions). Now when ever user try to perform some action, permission/role for that action is checked against user grantedAuthorities.
Also the defaultn RoleVoter uses prefix ROLE_, so any authority starting with ROLE_ is considered as ...
What is the performance of Objects/Arrays in JavaScript? (specifically for Google V8)
...;
var lastLongI = 1;
for(var i=0;i<10000;i++)
{
var before = Date.now();
for(var j=0;j<arrayCount;j++)
dynamicArrays[j][i] = i;
var span = Date.now() - before;
if (span > 10)
{
console.log(i + ": " + span + "ms" + " " + (i / lastLongI));
lastLongI =...
How to easily truncate an array with JavaScript?
...tooges = ["Moe", "Larry", "Shemp", "Curly", "Joe"];
stooges.length = 3; // now stooges is ["Moe", "Larry", "Shemp"]
Note: if you assign a length which is longer than current length, undefined array elements are introduced, as shown below.
var stooges = ["Moe", "Larry", "Shemp"];
stooges.length = ...