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Javascript Control Flow

Equality

• Triple Equals

•   1 === 1;
  

• type
• value
• Double Equals

•   1 == 1;
  

• Weird Examples

•   0 == "0"         // true
    0 == ""          // true
    0 == []          // true
  

•   0 == null        // false
    0 == undefined   // false
  

•   "true"  == true  // false
    "false" == false // false
  

•   5 == "5";
  

•   5 === Number("5");
  

• Truthy or Falsy?

•   ""       // falsy
    []       // truthy
    ()       // truthy
    NaN      // falsy
    Infinity // falsy
    0        // falsy
  

•          "" == false      // true
            0 == false      // true
           0n == false      // true
          Nan == false      // false
         null == false      // false
    undefined == false      // false
  

• memorize the 7 falsy values

• • ""
    • 0
    • 0n
    • NaN
    • undefined
    • null
    • false

• null == null              // true
  null == false             // false
  null == true              // false
  

Objects

  Obj1 === obj2   // always false
  

unless they are literally the same object. }

If Statements

  let condition  = true;
  let condition2 = false;
  if (condition) {
  console.log("Do action");
  } else if (condition2) {
  console.log("take alternative actions");
  } else {
  console.log("take default action");
  }