javascript

learning code for js

js is single threaded

GLOBAL EXECUTION .....> this GLOBAL EXECUTION context function execution context eval execution context ----> mongo

#memory creation phase --> allocate memory for declaration #Execution phase ----> execute code

#EXAMPLE let val = 10 let val2 = 5 function addNum(num1,num2){ let total = num1 + num2 return total } let result1 = addNum(val,val2) let result2 = addNum(10,2)

-----> val = undefined val2 = undefined addnum = defination result1 = undefined result2 = undefined

execution phase

value = 10 value2 = 5

#memory phase val = undefined val2 = undefined total = undefined

execution context

num1 = 10 === val num2 = 5 === val2 total = 10 + 5 return to global execution context;