Issue in d3.js: bisector consistently returning zero

http://jsfiddle.net/rdpt5e30/1/

const data = [
  {'year': 2005, 'value': 771900},
  {'year': 2006, 'value': 771500},
  {'year': 2007, 'value': 770500},
  {'year': 2008, 'value': 770400},
  {'year': 2009, 'value': 771000},
  {'year': 2010, 'value': 772400},
  {'year': 2011, 'value': 774100},
  {'year': 2012, 'value': 776700},
  {'year': 2013, 'value': 777100},
  {'year': 2014, 'value': 779200},
  {'year': 2015, 'value': 782300}
];

const bisect = d3.bisector(function(t: any) { return t.year; }).left;

console.log(bisect(data, 4));

Regardless of where I position it, the result is always index 0. This example seems to be a known one that has worked for many others, but strangely, it's not producing the expected outcome for me.

Any thoughts on why this might be happening?

Answer №1

Our current issue is that instead of passing an index to the function, it should be a value that aligns with the selector function; in this scenario, such as 2010 for instance.

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