Function

this

• global
• window
• undefined in strict mode
• function call on object
• this is the object
• constructor func
• new instance object
• arrow function
• this is the surrounding scope
• call, apply, bind
• this is the first argument

Arrow function

• no this
• scope: surrounding scope
• can't be used as constructor
• no arguments

call, apply, bind

• call: use rest parameters
• apply: array
• bind: return a new function

IIFE

• make a new scope in case of polluting global namespace

IIFE(Immediately invoked function expression)

(()=>{

})()