计算大量数据

Question

So, I have two scripts running in Node.js.

Script A outputs a whole number that is >= 40 and is <= 320.

Script B runs script A millions of times and needs to count how many times each number appears.

What is the best way to go about doing this? There has to be a better solution than typing let number40 = 0; let number 41 = 0; let number40 = 0; let number 41 = 0; all the way up to 320.

Answer 1

How about having a map-enum-like object holding key as number and as per their occurrences, incrementing their value;

 let obj = {}; let numbers = [50, 55, 120, 300, 150, 50, 300, 50]; numbers.forEach(function(num) { obj[num]? ++obj[num]: (obj[num] = 1); }); console.log(obj);

Useing Map

 let myMap = new Map(); let numbers = [50, 55, 120, 300, 150, 50, 300, 50]; numbers.forEach(function(num) { let val = myMap.get(num) || 0; myMap.set(num, ++val); }); console.log(myMap);//check browsers console to check the value.