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Converting string into datetime
...tinely parses obviously incorrect dates. For example, instantiating Date("20180912") somehow parses a value of 2018-11-21. Use at your own risk.
– bsplosion
Nov 21 '19 at 17:52
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JavaScript equivalent of jQuery's extend method
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You can use the ECMA 2018 spread operator in object literals...
var config = {key1: value1};
var default = {key1: default1, key2: default2, key 3: default 3};
var settings = {...default, ...config}
//resulting properties of settings:
settings ...
What's the best way to detect a 'touch screen' device using JavaScript?
...s on IE10/11 and Surface
};
console.log(is_touch_device3());
UPDATE 2018
Time goes by and there are new and better ways to test this. I've basically extracted and simplified Modernizr's way of checking it:
function is_touch_device4() {
if ("ontouchstart" in window || window.TouchEvent...
Checking if a key exists in a JavaScript object?
...therwise, use the slow in operator or hasOwnProperty() method.
EDIT: 12/04/2018 - NOT RELEVANT ANYMORE
As people have commented, modern versions of the Javascript engines (with firefox exception) have changed the approach for access properties. The current implementation is slower than the previous ...
bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...见bpftrace完整参考。
该教程贡献者是Brendan Gregg, Netflix (2018), 基于他的DTrace教程系列 DTrace Tutorial。
1. 列出所有探针
bpftrace -l 'tracepoint:syscalls:sys_enter_*'
"bpftrace -l" 列出所有探测点，并且可以添加搜索项。
探针是用于捕...
How to format a UTC date as a `YYYY-MM-DD hh:mm:ss` string using NodeJS?
... The folk(s) behind Moment have an experiment called Luxon as of Feb 2018 moment.github.io/luxon/index.html
– alxndr
Feb 21 '18 at 5:34
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JavaScript: How to find out if the user browser is Chrome?
...me on iOS. Thanks to xinthose for letting us know about this!
UPDATE 4/18/2018 - change for Opera check
Edited check for Opera, checking window.opr is not undefined since now Chrome 66 has OPR in window.navigator.vendor. Thanks to Frosty Z and Daniel Wallman for reporting this!
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Maximum number of threads per process in Linux?
...t
echo 200000 > /proc/sys/kernel/pid_max
./100k-pthread-create-app
2018 update from @Thomas, on systemd systems:
/etc/systemd/logind.conf: UserTasksMax=100000
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How can I update npm on Windows?
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(Feb 2018; it must have gotten easier!) I've been working with Node and npm for a couple years. I get Node msi's from nodejs.org. Each msi I've used has upgraded from an older Node version without complaint or notice. Recent Node ...
Prevent double submission of forms in jQuery
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Update in 2018: I just got some points for this old answer, and just wanted to add that the best solution would be to make the operation idempotent so that duplicate submissions are harmless.
Eg, if the form creates an order, put a uni...