21 Dec - start JS and install Node JS

1.0 setting

• run js in vs code → link
  • VS Code add extension code
  • install Node JS
• how use prompt ⇒ cant it in console
• run code auto scroll

2.9 Comparison

• Equals
  • = assignment
  • == equality test
  • === Strict equality
    • without type conversion
  • There is also a “strict non-equality” operator !== analogous to !=.

2.10 Conditional branching; if, ‘?’

• ! excalmation sign mean is NOT

2.11 logical operland

• boolean value
  • convert 0, null, undefined to false
  • It is true if valuse is not false
• how to use logical operland instead if statement
  • if(value) { result }
  • value ? true : false
  • value1 || value2 || value3
  • value1 && value2 && value3