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JavaScript capitalize first letter of words in a sentence

  function   titleCase ( str ) {    var   newarr  =  str . split ( " " );    console . log ( newarr );    for  ( let   i = 0 ; i < newarr . length ; i ++)   {      var   firstChar  =  newarr [ i ]. charAt ( 0 );      var   upper  =  firstChar . toUpperCase ();      var   newWords  =  upper + newarr [ i ]. slice ( 1 ). toLowerCase ();      newarr [ i ] =  newWords ;   }    console . log ( newarr );    str  =  newarr . join ( " " );    console . log ( str );    return   str ; } titleCase ( "I'm a little tea pot" );