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SIMPLE TASKS

HOISTING


console.log(b);

var b = 100;

console.log(b);


undefined

100


function hoist() {

console.log(a,b);

a = 20;

var b = 100;

console.log(a,b);

}

hoist();  

console.log(a);

console.log(window.a);

console.log(b)

Error


FUNCTION

function myfun(a,b) {

  console.log("hi");

  if(a==10)

  {

    return a-b;

  }

  console.log( a + b );

  return a+b;

  console.log("hello");

}


a1 = myfun(10,20);

 console.log( a1 );

 b1 = myfun(20,10);

 console.log( b1 );


a1 :

hi

-10

b1:

hi

30

30



var m1 = 10;


m1 = 20;


function f1(m1)


{

if(m1 == 10)


{

  m1 = 20;


   return 30;


}


if(m1 == 11)


{

  return;

}


return 30;


console.log(m1);

}



m1 = f1(10);

console.log(m1);

m1 = f1(11);

console.log(m1);

m1 = f1(20);

console.log(m1);


30

undefined

30



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HOISTING

  HOISTING Variables” and “ function” declarations are moved to the top of their scope before code execution. Variables are hosted and not their values Only the normal function will be hoisted not the anonymous,IIFE and Arrow Function will be hoisted Properties are not hoisted PROPERTY  Any variable declared globally  become property of window variable declared without keyword variable declared with keyword var except function scope var console . log ( a )   // Error a not defined console . log ( a );  // undefined --> var a is hoisted not value var   a  =  20 ; console . log ( a , b )  // Error --->property b can't hoist var   a  =  20 ; b  =  40 ; var   a  = add ( 2 , 5 )  // Error console . log ( a ) var   a  = add ( 2 , 5 )  // 7 function add hoist console . ...
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