ErnieKev questions

• React Redux adding extra field for action cause promise to return differently
• Firebase catch exception
• React Javascript Handle Possible Null Data
• Angular 2 Modal Popup Error "Expression has changed after it was checked"
• Angular Material 2 Md-ToolTip with show conditionally
• Angular Material md-select default selected value
• React prevent form submission when enter is pressed inside input
• Angular 2 Load CSS background-image from assets folder

ErnieKev answers