大约有 44,700 项符合查询结果（耗时：0.0364秒） [XML]
What is the difference between `let` and `var` in swift?
...
The let keyword defines a constant:
let theAnswer = 42
The theAnswer cannot be changed afterwards. This is why anything weak can't be written using let. They need to change during runtime and you must be using var instead.
The var defines an ordinary variable.
What is inte...
How do I write JSON data to a file?
...
2137
You forgot the actual JSON part - data is a dictionary and not yet JSON-encoded. Write it lik...
How to install Hibernate Tools in Eclipse?
...
answered Jan 27 '09 at 14:11
tremortremor
...
Get names of all files from a folder with Ruby
...
edited Nov 18 '09 at 13:02
Mike Woodhouse
47.6k1212 gold badges8585 silver badges123123 bronze badges
a...
Why does this method print 4?
...look at this with some examples.
Example 1: Suppose
X = 100
M = 1
R = 2
P = 1
Then C = floor((X-M)/R) = 49, and cnt = ceiling((P - (X - M - C*R))/R) = 0.
Example 2: Suppose that
X = 100
M = 1
R = 5
P = 12
Then C = 19, and cnt = 2.
Example 3: Suppose that
X = 101
M = 1
R = 5
P = 12
...
How to get key names from JSON using jq
...tBox", "Manifest-Version" : "1.0", "appname" : "testApp", "build-date" : "02-03-2014-13:41", "version" : "testBox" }
$ jq 'keys' file.json
[
"Archiver-Version",
"Build-Id",
"Build-Jdk",
"Build-Number",
"Build-Tag",
"Built-By",
"Created-By",
"Implementation-Title",
"Implementation-...
What is the maximum possible length of a query string?
...
RFC 2616 (Hypertext Transfer Protocol — HTTP/1.1) states there is no limit to the length of a query string (section 3.2.1). RFC 3986 (Uniform Resource Identifier — URI) also states there is no limit, but indicates the hostnam...
How to combine multiple conditions to subset a data-frame using “OR”?
...
254
my.data.frame <- subset(data , V1 > 2 | V2 < 4)
An alternative solution that mimics...
How do I convert between big-endian and little-endian values in C++?
...
1
2
Next
171
...
What are the options for storing hierarchical data in a relational database? [closed]
...00:053 (compared to 00:00:00:870)
Duration for 10,000 Nodes = 00:00:00:323 (compared to 00:01:01:783)
Duration for 100,000 Nodes = 00:00:03:867 (compared to 00:49:59:730)
Duration for 1,000,000 Nodes = 00:00:54:283 (compared to something like 2 days!!!)
Yes, that's correct. 1 million nodes c...