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`new function()` with lower case “f” in JavaScript
...been using "new function()" with a lower case "f" to define new objects in JavaScript. It seems to work well in all major browsers and it also seems to be fairly effective at hiding private variables. Here's an example:
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How to subtract date/time in JavaScript? [duplicate]
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Not the answer you're looking for? Browse other questions tagged javascript date or ask your own question.
Test if something is not undefined in JavaScript
...es, this is not a good way to perform the check because undefined is not a JavaScript keyword (although everyone seems to think it is). If you want to, you could create a variable called undefined and then this check will be incorrect. The only correct way is to check (typeof myVar !== 'undefined')....
How can I install a local gem?
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Edit: In some versions of ruby or rubygems, it don't work and fire
alerts or error, you can put gems in other place but not get DRY,
other alternative is using launch integrated command gem server and
add the localhost url in gem sources, more information in:
https://guides.rubygems.or...
How do I use format() on a moment.js duration?
...iff(start);
// execution
let f = moment.utc(diff).format("HH:mm:ss.SSS");
alert(f);
Have a look at the JSFiddle
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JavaScript: empty array, [ ] evaluates to true in conditional structures. Why is this?
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From http://www.sitepoint.com/javascript-truthy-falsy/
The following values are always falsy:
false
0 (zero)
"" (empty string)
null
undefined
NaN (a special Number value meaning Not-a-Number!)
All other values are truthy, including "0" (zero in quote...
How is the 'use strict' statement interpreted in Node.js? [duplicate]
...l be there. But it's your assumption. The Node.js code is nothing but your JavaScript code. All Node.js code are interpreted by the V8 JavaScript engine. The V8 JavaScript Engine is an open source JavaScript engine developed by Google for Chrome web browser.
So, there will be no major difference ho...
Convert date to another timezone in JavaScript
...aTime)).toISOString())
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString
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Do I need to heartbeat to keep a TCP connection open?
...are for application level considerations like failover, load balancing, or alerting administrators to potential problems.
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Testing javascript with Mocha - how can I use console.log to debug a test?
I am using the javascript test-runner "Mocha".
4 Answers
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