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Handling optional parameters in javascript
I have a static javascript function that can take 1, 2 or 3 parameters:
12 Answers
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How to check for an undefined or null variable in JavaScript?
We are frequently using the following code pattern in our JavaScript code
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Effective method to hide email from spam bots
....domain + '.' + this.dataset.tld; return false;"></a>
When javascript is disabled, just the click event will not work, email is still displayed.
Another interesting approach (at least without a click event) would be to make use of the right-to-left mark to override the writing direc...
How do you produce a .d.ts “typings” definition file from an existing JavaScript library?
...Also note that (barring bugs) TypeScript is supposed to be able to compile Javascript, so you can pass existing javascript code to the tsc compiler.
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Encode URL in JavaScript?
How do you safely encode a URL using JavaScript such that it can be put into a GET string?
19 Answers
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Capitalize words in string [duplicate]
...talize('fix this string'); // -> 'Fix This String'
* capitalize('javaSCrIPT'); // -> 'JavaSCrIPT'
* capitalize('javaSCrIPT', true); // -> 'Javascript'
*/
const capitalize = (str, lower = false) =>
(lower ? str.toLowerCase() : str).replace(/(?:^|\s|["'([{])+\S/g, ...
JavaScript “new Array(n)” and “Array.prototype.map” weirdness
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So is it a JavaScript failing that it's impossible to check whether it's an undefined pointer, or a pointer to undefined? I mean (new Array(1))[0] === [undefined][0].
– Trevor Norris
Sep 7 '12 at 2...
Typescript: difference between String and string
...A string, in TypeScript of type 'string'";
var s3: string;
String is the JavaScript String type, which you could use to create new strings. Nobody does this as in JavaScript the literals are considered better, so s2 in the example above creates a new string without the use of the new keyword and w...
In JavaScript can I make a “click” event fire programmatically for a file input element?
...; height: 30px; position: relative; top: -5px; left: -5px;"><a href="javascript: void(0)">Upload File</a></button>
<input type="file" id="upload_input" name="upload" style="font-size: 50px; width: 120px; opacity: 0; filter:alpha(opacity=0); position: relative; top: -40px;; l...
Javascript shorthand ternary operator
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The above answers are correct. In JavaScript, the following statement:
startingNum = startingNum ? otherNum : 1
can be expressed as
startingNum = otherNum || 1
Another scenario not covered here is if you want the value to return false when not matched....