Monthly hourly maximum rainfall
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// import trmm hourly precipitation
var trmm = ee.ImageCollection("??");
var rainfall =trmm.select("precipitation").filterDate("2017-11-01","2017-11-30");
var maximum = rainfall.??();
// filter for sri lanka
var countries = ee.FeatureCollection('ft:1tdSwUL7MVpOauSgRzqVTOwdfy17KDbw-1d9omPw');
var country_names = ['Sri Lanka'];
var myCountry = countries.filter(ee.Filter.inList('Country', country_names));
var aoi = myCountry.geometry();
// add map
Map.addLayer(maximum.clip(aoi),{min:0,max:??,palette:"??"},"??");
Open Geo Blog 
var maximum = rainfall.??(); what should i write in the brackets and in front of the brackets
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