Recently, I am playing with OCR with Google ML Kit. A few years ago, I wish OCR in my mobile app, I want to extra some text from the images. That was very very hard to do. Either I need to use some opensource projector in a web server, and the app will post the image to my web api to do OCR. Or I need to buy some expensive libraries to do that. But Now, I can use Google ML Kit to do that. I just need to import library in gradle. And then I need to create an instance of TextRecognizer. Finally, I need to call a method with the image to do the OCR. I can use do that on the device or with CloudAPI. If I choose to do that on the device, that is completely free. Even I use the cloud API, I got first 1,000 users are free. That is a good deal. That is a good choice for an indie developer as myself

When I got up last Sunday morning, I tried to turn on my mac pro which is a 2011 model. That is relatively old, but that is still in good shape. On that morning, it got me a black screen. It has a startup sound. I tried to press the keys randomly. It went to a forgotten password screen. I followed the instructions to reset my password. That still was not working. After a restart, that was still a black screen. Finally, I tried to use Control+Option+Command+Power, trying to reset NVRAM. It accomplishes this times. I believe for some reasons, the NVRAM saved the setting to dim the screen to a black screen.

I watched the keynotes of WWDC 2018, tag line is "Software Only". There are no new iPhone or Mac. I am disappointing, I am expecting there will be a CPU refresh for MacBook Pro,it switched to use the 8th Generation CPU. Only software update this year
iOS 12
- more powerful AR
- personalised Memoji
- Better Performance
- You can add a shortcut in Siri

macOS
- Dark Mode

watchOS
- Better health and sport features
- Walkie-talkie functions for LTE version

I am new to Angular. However, I have used AnuglarJS for a year. That is very hard to catch up. Today, I found a silly error. I cannot add an element to an array by using Pushj function. I got an error,Push is not defined.

students : Person[];
constructor(){
var newPerson = new Person();
this.students.push(newPerson);
}

Finally, I found, I am so silly. The array is not initialized yet.
I need to do that.

students : Person[];
constructor(){
this.students = []
var newPerson = new Person();
this.students.push(newPerson);
}


I got an old MacBook Pro which only has two USB ports. I used an external keyboard and mouse. Both require USB ports. They left no room to connect a phone for debugging. Recently, I found there is a feature in visual studio. This new feature allows the developers to connect the devices via wifi. This measure can free up USB ports. Moreover, this method can do the debugging wireless, that is more convenient, I can carry the debugging device around and without wires, which can keep my desk cleaner.
Although it said that is wireless, you still need to connect with USB and open the device windows in the XCode. Then you need to check the box to enable wifi debug. After that, that is very easy. You select the device in Visual Studio when the device connected to the same wifi networks.