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basz/gist:41dce162d4567170d0ca04a556e4a5e3

Created January 17, 2019 11:21
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gistfile1.txt
addedElements: computed('elements.[]', function() {
const elements = this.get('elements');
const newElements = elements.filter(element => !this.get('prevElements').includes(element));
this.set('prevElements', elements.copy()); // this is *bad*
return newElements;
}),
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