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/Special Snowflake (4.2).js

Created July 31, 2016 19:53
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https://repl.it/CU9P/145 created by sethopia
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Special Snowflake (4.2).js
/*
SPECIAL SNOWFLAKES
Create a function that takes 3 arrays of mixed elements and returns an array of only elements that are unique to the arrays
eg)
snowflake(['dog','cat','mouse'], [3, 'dog'], ['cat', 2, 1]) ==> [3,2,1,'mouse'];
*/
function snowflake() {
var returnArr = [];
var arrays = arguments;
for (var array = 0; array < arrays.length; array++) {
var thisArray = arrays[array];
for (var index = 0; index < thisArray.length; index++) {
var uniqueElement = true;
if (thisArray.indexOf(thisArray[index]) !== thisArray.lastIndexOf(thisArray[index])) uniqueElement = false;
var arrayToCheck = 0;
while (uniqueElement && arrayToCheck < arrays.length) {
if (arrayToCheck !== array && arrays[arrayToCheck].indexOf(thisArray[index]) > -1) {
uniqueElement = false;
}
arrayToCheck++;
}
if (uniqueElement) {
returnArr.push(thisArray[index]);
}
}
}
return returnArr;
}
// A more elegant second attempt is below, arrived at after discussion with Will Jacobson, the instructor.
function snowflake2() {
var returnArr = [];
var flatArr = [];
var arrays = arguments;
for (var array = 0; array < arrays.length; array++) {
var thisArray = arrays[array];
for (var index = 0; index < thisArray.length; index++) {
flatArr.push(thisArray[index]);
}
}
for (var i = 0; i < flatArr.length; i++) {
if (flatArr.indexOf(flatArr[i]) === flatArr.lastIndexOf(flatArr[i])) returnArr.push(flatArr[i]);
}
return returnArr;
}
console.log(snowflake(['dog','cat','mouse'], [3, 'dog'], ['cat', 2, 1], ['zebra',5], [4, 4]));
console.log(snowflake2(['dog','cat','mouse'], [3, 'dog'], ['cat', 2, 1], ['zebra',5], [4, 4]));
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Special Snowflake (4.2)_console_dump.txt
Native Browser JavaScript
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