Yo dawg, I herd you like loops, so jQuery put a loop in your code

confusion.js

// Indications of Confusion
$( ".bla" ).each( function() {
  $( this ).css( "color", "green" );
});

explicit-loops.js

// Explicit Loops
$( ".bla" ).each( function( index, element ) {
  $( element ).append( index );
});

implicit-loops.js

// Implicit Loops
$( ".bla" ).addClass( "highlight" );

slowness.js

// Performance Implications
$( ".bla" ).css( "x", "y" ).css( "a", "b" );