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How can I check whether a option already exist in select by JQuery

...jQuery do it like all the other answers. Although this would work, it's re-inventing the wheel. – Peter Apr 4 '13 at 18:33 15 ...
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Get the first key name of a javascript object [duplicate]

... our stackOverflow account handle and we've made a whole bunch of money by inventing time travel, but that is beside the point. I just wanted to say, "Thanks", this little note helped me out. – isaacdre Oct 11 '18 at 0:54 ...
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【活动取消】App Inventor 2 中文网学习合作计划,快速提升你的App Invento...

...机会! 2、免费开通一个月VIP,提供不限次的技术支持,社区资源应享尽享。 3、社区发帖记录自己的学习过程,我们会及时回复及答疑,主题不限,自己感兴趣或擅长的就行,或者和我们商量。 学习成果: 1、一个月内 B站...
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How to check 'undefined' value in jQuery

... you need to check a variable against undefined value, there is no need to invent any special method, since JavaScript has a typeof operator, which is simple, fast and cross-platform: if (typeof value === "undefined") { // ... } It returns a string indicating the type of the variable or other...
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How do I get the last four characters from a string in C#?

... I feel like this should be the accepted answer. Why re-invent the wheel? – Zack Aug 4 '14 at 16:54 2 ...
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Animate visibility modes, GONE and VISIBLE

...ding, right disappearing. It's might not do exactly what you need but with inventive spirit you can make it work ;) share | improve this answer | follow | ...
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How can I trim beginning and ending double quotes from a string?

...-expression.info. That said, this smells a bit like that you're trying to invent a CSV parser. If so, I'd suggest to look around for existing libraries, such as OpenCSV. share | improve this answer...
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What does “:=” do?

...nt to these other references that were probably in the minds of those that invented it, but it's really just that plane equals and less that equals were taken (or potentially easily confused with =<) and something new to define assignment was needed and that made the most sense. Historical Refer...
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Numeric for loop in Django templates

... time involved in working around not having it, not to mention the need to invent an entirely new langauge when a perfectly awesome one (python!) is already right there! – Bogatyr Feb 11 '16 at 16:40 ...
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The tilde operator in C

...efined without specifying -from outside information probably- what sign to invent. Your two comments got different replies because they specify opposite directions. – Chuck Kollars May 25 '16 at 17:20 ...