Javascript: difference between var, let and const
var: Declare a variable, value initialization optional. Can re-declared and re-initialize. let: Declare a local variable with block scope, value initialization optional. Can re-initialize but…
Category: JS
Node.JS on Windows: how to fix error spawn child process don’t work with the quotes
Example code: This process run unsucessfully, cause the quotes is escaped. So, you must use option: windowsVerbatimArguments
Some errors when using puppeteer on Linux
Error 1: Fix: Error 2: Fix: Error 3: Fix: Use –no-sandbox Error 4: or Check version: Fix: Now version is 7.5.1804
Angular lesson 5: Parent component listens for child event
The child component exposes an EventEmitter property with which it emits events when something happens. The parent binds to that event property and reacts to…
Angular lesson 4: Intercept input property changes with ngOnChanges()
We can detect and act upon changes to input property values with the ngOnChanges() method of the OnChanges interface. Child component: src/app/child/child.component.html src/app/child/child.component.css src/app/child/child.component.ts Parent…
Angular lesson 3: pass data from parent component to child with input binding
In lesson 2, we learnt about Component. Now, we continue learn about component. Step 1: Create file school.ts in src/app Step 2: edit some files…
Angular lesson 2: Components
In the previous tutorials (Lesson 1), we have seen the default component is app component: There are 5 files: The app component were created by…
Angular lesson 1: Simple example
Requirements: + Node.js + Npm Step 1: Install angular-cli Now you can use angular-cli: Step 2: install typecrypt Step 3: Open Webstorm and create new…
How to capitalize first character of a string in Javascript
Function ucfirst in Javascript Method 1: Example: Try it yourself
Max Uint8Array length
Test for v6.10.1: So, we have the result: