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java: ArrayList - how can i check if an index exists?
...ing> and I add data at specific indices,
how can I check if a specific index exists?
11 Answers
...
Most efficient way to check for DBNull and then assign to a variable?
...ional example, no - it really shouldn't (and doesn't). It will execute the indexer twice.
– Marc Gravell♦
Oct 21 '08 at 12:06
...
XPath: select text node
...t or
the second text node via XPath?
Use:
/node/text()
This selects all text-node children of the top element (named "node") of the XML document.
/node/text()[1]
This selects the first text-node child of the top element (named "node") of the XML document.
/node/text()[2]
This selects th...
how to get the one entry from hashmap without iterating
...no such thing as 'the first entry', and that's also why there is no get-by-index method on Map (or HashMap).
You could do this:
Map<String, String> map = ...; // wherever you get this from
// Get the first entry that the iterator returns
Map.Entry<String, String> entry = map.entrySet...
How can I find the length of a number?
..."Starting weissteinLength length.");
let startTime = Date.now();
for (let index = 0; index < iterations; index++) {
weissteinLength(Math.random() * maxSize);
}
console.log("Ended weissteinLength length. Took : " + (Date.now() - startTime ) + "ms");
// ------- String length slowest.
conso...
How to output loop.counter in python jinja template?
...
The counter variable inside the loop is called loop.index in jinja2.
>>> from jinja2 import Template
>>> s = "{% for element in elements %}{{loop.index}} {% endfor %}"
>>> Template(s).render(elements=["a", "b", "c", "d"])
1 2 3 4
See http://jinja...
How to Get True Size of MySQL Database?
... MySQL forum:
SELECT table_schema "database name",
sum( data_length + index_length ) / 1024 / 1024 "database size in MB",
sum( data_free )/ 1024 / 1024 "free space in MB"
FROM information_schema.TABLES
GROUP BY table_schema;
Or in a single line for easier copy-pasting:
SELECT table_sche...
How to un-submodule a Git submodule?
...rm),
and remove the special entry representing that submodule SHA1 in the index of the parent repo (rm).
Once the removal of the submodule is complete (deinit and git rm), you can rename the folder back to its original name and add it to the git repo as a regular folder.
Note: if the submodule w...
Size of Matrix OpenCV
... y axis, 4 for x axis.
By x, y, z, it means the order of the dimensions. x index changes the fastest.
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How can I perform a culture-sensitive “starts-with” operation from the middle of a string?
...o know the length of the substring that was actually matched. But Compare, IndexOf ..etc
throw that information away. It could be possible with regular expressions but the implementation doesn't do full case folding and so doesn't match
ß to ss/SS in case-insensitive mode even though .Compare and ....