ColdFusion block to output the intersection of two arrays

gistfile1.cfm

<cfscript>
colourArray = ["Red","Orange","Yellow","Green","Blue","Indigo","Violet"];
colourArrayTwo = ["Yellow","Green","Red","Violet"];
presentInBoth = [];

// loop initial array with values
for(i=1;i<=arrayLen(colourArray);i++) {
  // loop over inner array
  for(j=1;j<=arrayLen(colourArrayTwo);j++) {
  
  // compare the values of the outer array and the inner array and append value to resulting array
  if (colourArray[i] == colourArrayTwo[j])
    presentInBoth.arrayAppend(presentInBoth,colourArray[i]);
    
  }
}

writedump(presentInBoth);
</cfscript>