JavaScript(3)---Conditional Statements

Conditional Statements

Goal of this lesson:  explore how programs make decisions by evaluating conditions and introduce logic into code and covering the following concepts:

• if, else if, and else statements.
• comparison operators.
• logical operators.
• truthy vs falsy values.
• ternary operators.
• the switch statement.

EX: 

if (mood === 'sleepy' && tirednessLevel > 8) {

  console.log('time to sleep');

} else {

  console.log('not bed time yet');

}

• -Evaluate to false when checked as a condition? The list of falsy values includes:
• 0
• Empty strings like "" or ''
• null which represent when there is no value at all
• undefined which represent when a declared variable lacks a value
• NaN, or Not a Number
• True will be numbers

1. A short-circuit evaluation to assign a value to writingUtensil

EX: ${writingUtensil} 

|| or statements check the left-hand condition first

What did I learn today?

What I'll be doing tomorrow?

  I will be learning about functions in JavaScript.