Haifeng Zhang

Haifeng Zhang has asked 30 questions and find answers to 57 problems.

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When performance matters, professionals practice.

My Site | haifzhan[at]gmail[dot]com

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Haifeng Zhang questions

Why containsKey() of Map only invoke hashCode()?
Canada Post Rates Error in Ionic Project Response for preflight has invalid HTTP status code 500
How to disable console.log() on production and display a banner?
How to map Java/Kotlin string array and Postgres SQL array with JPA and hibernate
Ionic3 ionic native google maps doesn't show map but only google logo (display grey blank map )
Race conditions "check-then-act" and "read-modify-write"
cairocffi install failed on Ubuntu 18.04
Canvas charts is blurry when download as PDF
How to maximize Window to Left/Right Half Screen?
Python refactoring fails in Visual Studio Code

Haifeng Zhang answers

Replicating "tail -f" with Python
Filtering a dictionary by multiple values
Should toString() ever return null? [duplicate]
How to convert this text file into a dictionary?
Angular - How to create a persistent/permanent "Add to Home screen" button in my web app, just like Google Contribute
From virtualenv, pip freeze > requirements.txt give TONES of garbage! How to trim it out?
Canada Post Rates Error in Ionic Project Response for preflight has invalid HTTP status code 500
google plus login in ionic returns error 10
Canvas charts is blurry when download as PDF
Angular 4: NgModel doesn't work. Does not set value to "date" field