kibana-123/src/core_plugins/timelion/server/series_functions/subtract.js

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

var reduce = require('../lib/reduce.js');


var Chainable = require('../lib/classes/chainable');
module.exports = new Chainable('subtract', {
  args: [
    {
      name: 'inputSeries',
      types: ['seriesList']
    },
    {
      name: 'term',
      types: ['seriesList', 'number'],
      help: 'Number or series to subtract from input. If passing a seriesList it must contain exactly 1 series.'
    }
  ],
  help: 'Subtract the values of one or more series in a seriesList to each position, in each series, of the input seriesList',
  fn: function subtractFn(args) {
    return reduce(args, function (a, b) {
      return a - b;
    });
  }
});