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IF… OR IF… in a windows batch file
...or variable. Initialize it to be undefined, and then define it only if any one of the OR conditions is true. Then use IF DEFINED as a final test - no need to use delayed expansion.
FOR ..... DO (
set "TRUE="
IF cond1 set TRUE=1
IF cond2 set TRUE=1
IF defined TRUE (
...
) else (
......
Are there any SHA-256 javascript implementations that are generally considered trustworthy?
...t. I was expecting there to be some kind of authoritative script that everyone used, but I'm finding loads of different projects all with their own implementations.
...
Blank HTML SELECT without blank item in dropdown list
...r hidden attributes:
<option selected disabled hidden style='display: none' value=''></option>
selected makes this option the default one.
disabled makes this option unclickable.
style='display: none' makes this option not displayed in older browsers. See: Can I Use documentation for...
Multiple inputs with same name through POST in php
...our question, this is a perfectly accetable approach. You might want to go one stage further, and have address[0][street] address[0][city] address[0][zip], address[1][street] address[1][city] address[1][zip] ... You can read these with $_POST['address'][0]['city'], for instance
...
What does the ^ operator do in Java?
... "this or that, but not both!".
See also
Wikipedia: exclusive-or
Exponentiation in Java
As for integer exponentiation, unfortunately Java does not have such an operator. You can use double Math.pow(double, double) (casting the result to int if necessary).
You can also use the traditional bi...
Is explicitly closing files important?
...rely on the Python garbage-collection to close all files? For example, if one does this:
6 Answers
...
best way to add license section to iOS settings bundle
My iOS application uses a number of third party components licensed under Apache 2.0 and similar licenses, which requires me to include various bits of text, this kind of thing:
...
PostgreSQL LIKE query performance variations
...ram indexes to support all LIKE and ILIKE patterns, not just left-anchored ones:
Example index:
CREATE INDEX tbl_col_gin_trgm_idx ON tbl USING gin (col gin_trgm_ops);
Or:
CREATE INDEX tbl_col_gist_trgm_idx ON tbl USING gist (col gist_trgm_ops);
Difference between GiST and GIN index
Example...
Android代码优化小技巧 - 更多技术 - 清泛网 - 专注C/C++及内核技术
....length; ++i) {
sum += mArray[i].mSplat;
}
}
public void one() {
int sum = 0;
Foo[] localArray = mArray;
int len = localArray.length;
for (int i = 0; i < len; ++i) {
sum += localArray[i].mSplat;
}
}
public void two() {
int sum = 0;
...
Can every recursion be converted into iteration?
...
Can you always turn a recursive function into an iterative one? Yes, absolutely, and the Church-Turing thesis proves it if memory serves. In lay terms, it states that what is computable by recursive functions is computable by an iterative model (such as the Turing machine) and vice v...