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What is this 'Lambda' everyone keeps speaking of?
... {
if (numbers[i] % 2 === 0) {
even.push(numbers[i]);
}
}
alert(even);
// Using the filter method
even = [1, 2, 3, 4].filter(function (number) {
return number % 2 === 0;
});
alert(even);
Code execution delay
In some environments, in which the concept of event is available, ...
“Variable” variables in Javascript?
...ng eval():
var data = "testVariable";
eval("var temp_" + data + "=123;");
alert(temp_testVariable);
Or using the window object:
var data = "testVariable";
window["temp_" + data] = 123;
alert(window["temp_" + data]);
http://www.hiteshagrawal.com/javascript/dynamic-variables-in-javascript
...
image.onload event and browser cache
I want to create an alert box after an image is loaded, but if the image is saved in the browser cache, the .onload event will not be fired.
...
How to append something to an array?
...ar ar1 = [1, 2, 3];
var ar2 = [4, 5, 6];
var ar3 = ar1.concat(ar2);
alert(ar1);
alert(ar2);
alert(ar3);
The concat does not affect ar1 and ar2 unless reassigned, for example:
var ar1 = [1, 2, 3];
var ar2 = [4, 5, 6];
ar1 = ar1.concat(ar2);
alert(ar1);
Lots of great i...
Will HTML5 allow web apps to make peer-to-peer HTTP connections?
...iques), it is not particularly efficient.
This would open a large hole for XSS attacks.
WebSockets is designed to solve the second of these issues, but (deliberately, I expect) not the other two. When they talk about peer-to-peer in the HTML5 spec, they are talking about full duplex communications...
Stopping scripters from slamming your website
...orkshop, the subsidiary of Woot that does the design, writes the product descriptions, podcasts, blog posts, and moderates the forums. I work with CSS/HTML and am only barely familiar with other technologies. I work closely with the developers and have talked through all of the answers here (and man...
What are bitwise operators?
...
These are the bitwise operators, all supported in JavaScript:
op1 & op2 -- The AND operator compares two bits and generates a result of 1 if both bits are 1; otherwise, it returns 0.
op1 | op2 -- The OR operator compares two bits and generates a result of 1 if the bits are...
How to implement a confirmation (yes/no) DialogPreference?
...
That is a simple alert dialog, Federico gave you a site where you can look things up.
Here is a short example of how an alert dialog can be built.
new AlertDialog.Builder(this)
.setTitle("Title")
.setMessage("Do you really want to whatever?...
Declaring javascript object method in constructor function vs. in prototype [duplicate]
...kCount = 0;
this.bark = function() {
barkCount++;
alert(this.name + " bark");
};
this.getBarkCount = function() {
alert(this.name + " has barked " + barkCount + " times");
};
};
Dog.prototype.wagTail = function() {
alert(this.name + " waggi...
typeof for RegExp
...
You can use instanceof operator:
var t = /^foo(bar)?$/i;
alert(t instanceof RegExp);//returns true
In fact, that is almost the same as:
var t = /^foo(bar)?$/i;
alert(t.constructor == RegExp);//returns true
Keep in mind that as RegExp is not a primitive data type, it is not pos...