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Callback Hell

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      < h1 > call Hell Demo </ h1 > let h1 = document . querySelector ( "h1" ); function changeColor ( color , delay , NextchangeColor ) {   setTimeout (() => {     h1 . style . color = color ;     if ( NextchangeColor ) NextchangeColor ();   }, delay ); } changeColor ( "red" , 1000 ,() => {     changeColor ( "blue" , 1000 ,() => {         changeColor ( "orange" , 1000 ,() => {             changeColor ( "green" , 1000 ,() => {                 changeColor ( "yellow" , 1000 );             })         })     }) });
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TODO list with DOM

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 HTML <! DOCTYPE html > < html lang = "en" > < head >     < meta charset = "UTF-8" >     < meta name = "viewport" content = "width=device-width, initial-scale=1.0" >     < title > TODO List with DOM </ title > </ head > < body >     < h1 > TODO List </ h1 >     < input placeholder = "Enter Task" >     < button > Add Task </ button >     < ul >         < li > Eat < button class = "delbtn" > delete </ button ></ li >         < li > Sleep < button class = "delbtn" > delete </ button ></ li >     </ ul >     < script src = "TODOwithDOM.js" ></ script > </ body > </ html > JS let btn = document . querySelector ( "button" ); let inp = document . querySelector ( "input" ); let ul = do...
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  let h1 = document . querySelector ( "h1" ); function changeColor ( color , delay ) {   return new Promise (( resolve , reject ) => {     setTimeout (() => {       h1 . style . color = color ;       resolve ( "color changed" );     }, delay );   }); } changeColor ( "red" , 1000 )   . then (() => {     console . log ( "Color changed to Red" );     return changeColor ( "orange" , 1000 );   })   . then (() => {     console . log ( "color changed to orange" );     return changeColor ( "green" , 1000 );   })   . then (() => {     console . log ( "color changed to green" );     return changeColor ( "blue" , 1000 );   })   . then (() => {     console . log ( "color changed to blue" );   });
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