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November 21, 2015 05:07
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Javascript function to return an array containing the items that occur in one but not both input arrays. Need to refactor this.
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/** | |
* diff two arrays - return the elements that occur in one but not both input arrays | |
* note to self: This works but there has to be a better (more performant) solution | |
* Revisit this and look into removing items from both arrays as they're discovered | |
**/ | |
function diff(arr1, arr2) { | |
// get the items from arr1 that aren't in arr2 | |
var filteredArr1 = arr1.filter( function( el ) { | |
return arr2.indexOf( el ) < 0; | |
} ); | |
// now get the items from arr2 that aren't in arr1 | |
var filteredArr2 = arr2.filter( function( el ) { | |
return arr1.indexOf( el ) < 0; | |
} ); | |
// group them up and return them | |
return filteredArr1.concat(filteredArr2); | |
} | |
diff([1, 2, 3, 5], [1, 2, 3, 4, 5]); |
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