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How to check if a map contains a key in Go?
...thout worrying about the actual
value, you can use the blank identifier (_) in place of the usual
variable for the value.
_, present := timeZone[tz]
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...
WKWebView not loading local files under iOS 8
...tURL = tmpDirURL.appendingPathComponent(fileURL.lastPathComponent)
let _ = try? fm.removeItem(at: dstURL)
try! fm.copyItem(at: fileURL, to: dstURL)
// Files in "/temp/www" load flawlesly :)
return dstURL
}
And can be used as:
override func viewDidLoad() {
super.viewDidLoad()
...
How to remove array element in mongodb?
...
Try the following query:
collection.update(
{ _id: id },
{ $pull: { 'contact.phone': { number: '+1786543589455' } } }
);
It will find document with the given _id and remove the phone +1786543589455 from its contact.phone array.
You can use $unset to unset the value ...
python assert with and without parenthesis
...a convenient way to insert debugging assertions into a program:
assert_stmt ::= "assert" expression ["," expression]
The simple form, assert expression, is equivalent to
if __debug__:
if not expression: raise AssertionError
The extended form, assert expression1, expression2, is equi...
How do I convert a Vector of bytes (u8) to a string
...string slice (assuming a UTF-8 encoding):
use std::str;
//
// pub fn from_utf8(v: &[u8]) -> Result<&str, Utf8Error>
//
// Assuming buf: &[u8]
//
fn main() {
let buf = &[0x41u8, 0x41u8, 0x42u8];
let s = match str::from_utf8(buf) {
Ok(v) => v,
E...
NASM x86汇编入门指南 - C/C++ - 清泛网 - 专注C/C++及内核技术
...编入门指南原文链接:http: docs.cs.up.ac.za programming asm derick_tut #helloworld内容1.介绍2.为什么写这篇文章3.NASM(The...NASM x86汇编入门指南
原文链接:http://docs.cs.up.ac.za/programming/asm/derick_tut/#helloworld
内容
1. 介绍
2. 为什么写这篇文...
How to download image from url
..."https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xpf1/v/t34.0-12/10555140_10201501435212873_1318258071_n.jpg?oh=97ebc03895b7acee9aebbde7d6b002bf&oe=53C9ABB0&__gda__=1405685729_110e04e71d9");
using (MemoryStream mem = new MemoryStream(data))
{
using (var yourImage = Image.Fro...
Can I find events bound on an element with jQuery?
...
In modern versions of jQuery, you would use the $._data method to find any events attached by jQuery to the element in question. Note, this is an internal-use only method:
// Bind up a couple of event handlers
$("#foo").on({
click: function(){ alert("Hello") },
mous...
What is the default text size on Android?
...
Default values in appcompat-v7
<dimen name="abc_text_size_body_1_material">14sp</dimen>
<dimen name="abc_text_size_body_2_material">14sp</dimen>
<dimen name="abc_text_size_button_material">14sp</dimen>
<dimen name="abc_text_size_caption...
Add Foreign Key to existing table
...
To add a foreign key (grade_id) to an existing table (users), follow the following steps:
ALTER TABLE users ADD grade_id SMALLINT UNSIGNED NOT NULL DEFAULT 0;
ALTER TABLE users ADD CONSTRAINT fk_grade_id FOREIGN KEY (grade_id) REFERENCES grades(id);
...