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Explore variables value and state

expression, e, print, p, po

(lldb) print ... = (lldb) p ... = (lldb) expression -- ... = (lldb) e -- ...

Evaluate an expression on the current thread. Display any returned value with LLDB defalt formating.

1. Usage

• (lldb) e
• (lldb) expression

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extension UIImage{
    func merge(mergewith: UIImage) -> UIImage {
        
        UIGraphicsBeginImageContextWithOptions(size, false, 0.0)
        
        let actualArea = CGRect(x: 0, y: 0, width: size.width, height: size.height)
        
        let ratioMerge: Double = Double(mergewith.size.height / mergewith.size.width)
        let widthMerge = size.height / ratioMerge
        let mergeX = (size.width / 2) - (widthMerge / 2)

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function banarySearch(key, arr, min, max, callBack) {
  if (min >= max) {
    return undefined;
  }
  const midIndex = parseInt(min + (max - min) / 2, 0.0);
  const result = callBack(arr[midIndex]);
  if (result > key) {
    return banarySearch(key, arr, min, midIndex, callBack);
  } else if (result < key) {

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// recursive
func binarySearch<T>(key: Int, arr: [T], range: Range<Int>? = nil, _ callBack: (T) -> Int) -> Int? {
  var rangeDefault: Range<Int>
  if let r = range {
    rangeDefault = r
  } else {
    rangeDefault = 0..<arr.count
  }
  if rangeDefault.lowerBound >= rangeDefault.upperBound {
    return nil

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(from : https://simplifiedthinking.co.uk/2015/10/03/install-mqtt-server/ )

Installing Brew

The Mosquitto MQTT Server can be easily installed using Homebrew.  If it’s not installed on your system already, then a quick visit to the homepage will give you all you need to get going.  Homebrew is an OS X Package Manager for installing and updating non-Mac OS X utilities that are more commonly found in other variants of Linux.  To install the basic package manager run the following command.

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Installing Mosquitto MQTT

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package main

 
import "encoding/json"
import "fmt"

 
type Person struct {
    Name string   `json:"name"`

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# when you try to start docker 
# sudo systemctl start docker
# and the output is: Failed to start docker.service: Unit docker.service is masked.
# 
# 
# ls -la /etc/systemd/system | grep docker
# see for /dev/null if there is
systemctl unmask docker.service 
systemctl unmask docker.socket 
systemctl start docker.service 

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# when you try to start docker 
# sudo systemctl start docker
# and the output is: Failed to start docker.service: Unit docker.service is masked.
# 
# 
# ls -la /etc/systemd/system | grep docker
# see for /dev/null if there is
systemctl unmask docker.service 
systemctl unmask docker.socket 
systemctl start docker.service 

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/**
 * Definition for singly-linked list.
 * type ListNode struct {
 *     Val int
 *     Next *ListNode
 * }
 */
func mergeTwoLists(list1 *ListNode, list2 *ListNode) *ListNode {
    var dummy = new(ListNode)
    var p = dummy

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docker logs --since=2022-07-05T17:30:00Z help-check-bot-cn