use of _.sumBy
by Nivaldo
HTML
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>JavaScript
var results = [{"Year":1992,"APA Publications":0,"Non-APA Publications":1},{"Year":1993,"APA Publications":0,"Non-APA Publications":1},{"Year":1994,"APA Publications":1,"Non-APA Publications":2},{"Year":1995,"APA Publications":1,"Non-APA Publications":0},{"Year":1996,"APA Publications":0,"Non-APA Publications":2},{"Year":1997,"APA Publications":1,"Non-APA Publications":1},{"Year":1998,"APA Publications":8,"Non-APA Publications":7},{"Year":1999,"APA Publications":2,"Non-APA Publications":4},{"Year":2000,"APA Publications":3,"Non-APA Publications":2},{"Year":2001,"APA Publications":3,"Non-APA Publications":9},{"Year":2002,"APA Publications":3,"Non-APA Publications":4},{"Year":2003,"APA Publications":4,"Non-APA Publications":4},{"Year":2004,"APA Publications":8,"Non-APA Publications":6},{"Year":2005,"APA Publications":3,"Non-APA Publications":3},{"Year":2006,"APA Publications":7,"Non-APA Publications":9},{"Year":2007,"APA Publications":4,"Non-APA Publications":8},{"Year":2008,"APA Publications":5,"Non-APA Publications":9},{"Year":2009,"APA Publications":4,"Non-APA Publications":8},{"Year":2010,"APA Publications":4,"Non-APA Publications":10},{"Year":2011,"APA Publications":4,"Non-APA Publications":12},{"Year":2012,"APA Publications":3,"Non-APA Publications":10},{"Year":2013,"APA Publications":3,"Non-APA Publications":9},{"Year":2014,"APA Publications":3,"Non-APA Publications":10},{"Year":2015,"APA Publications":1,"Non-APA Publications":12},{"Year":2016,"APA Publications":3,"Non-APA Publications":13},{"Year":2017,"APA Publications":2,"Non-APA Publications":2}];
var count = _.sumBy(results, function(o) { return o["APA Publications"] + o["Non-APA Publications"]; });
console.log(count);