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How do I check if an object has a key in JavaScript? [duplicate]
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and even better - if(myObj && 'key' in myObj)
– pkdkk
Sep 3 '15 at 13:53
11
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gitx How do I get my 'Detached HEAD' commits back into master [duplicate]
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git push origin HEAD:master
to push directly, or
git checkout master && git merge [ref of HEAD]
will merge it back into your local master.
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jQuery dot in ID selector? [duplicate]
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From the docs:
To use any of the meta-characters (such as
!"#$%&'()*+,./:;<=>?@[\]^`{|}~) as a literal part of a name, it must
be escaped with with two backslashes: \\. For example, an element with
id="foo.bar", can use the selector $("#foo\\.bar").
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:after and :before pseudo-element selectors in Sass [duplicate]
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Use ampersand to specify the parent selector.
SCSS syntax:
p {
margin: 2em auto;
> a {
color: red;
}
&:before {
content: "";
}
&:after {
content: "* * *";
}
}
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“while :” vs. “while true” [duplicate]
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It's true. i=0; time while true; do ((i++>100000)) && break; done takes slightly longer than the colon version.
– Paused until further notice.
May 29 '12 at 12:50
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Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails
...d FROM sourcecodes) should help to get rid of those IDs. Or if null is not allowed in sourcecode_id, then remove those rows or add those missing values to the sourcecodes table.
– naXa
Feb 23 '16 at 14:28
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How to convert decimal to hexadecimal in JavaScript
... yourNum is a hex string in this case. E.g. (255).toString(16) == 'ff' && parseInt('ff', 16) == 255
– Prestaul
Jul 8 '11 at 19:14
8
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Generate array of all letters and digits
...ontent-policy\"\u003e(content policy)\u003c/a\u003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true,enableSnippets:true
});
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How do you clear a slice in Go?
... slice (with array). I've edited my question to clarify and to show some example code from the standard library.
– Chris Weber
Jun 7 '13 at 15:19
1
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Cannot delete or update a parent row: a foreign key constraint fails
... (`advertiser_id`)
REFERENCES `jobs` (`advertiser_id`);
...is actually the opposite to what it should be. As it is, it means that you'd have to have a record in the jobs table before the advertisers. So you need to use:
ALTER TABLE `jobs`
ADD CONSTRAINT `advertisers_ibfk_1` FOREIGN KEY...