Remove all elements contained in another array

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Use the Array.filter() method:

myArray = myArray.filter( function( el ) {
  return toRemove.indexOf( el ) < 0;
} );

Small improvement, as browser support for Array.includes() has increased:

myArray = myArray.filter( function( el ) {
  return !toRemove.includes( el );
} );

Next adaptation using arrow functions:

myArray = myArray.filter( ( el ) => !toRemove.includes( el ) );

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