Filtering on json import in d3js

Question

I am learning d3js and stuck on some simple steps... I am importing json data and need to filter only data of year 2010. This is my import part:

d3.json("data/data.json").then(data => {
    data.forEach(d => {
        d.income = +d.income
        d.life_exp = +d.life_exp
        d.year = +d.year
    })
})

Where and how I need to add filtering part?

Answer 1

Just insert filter before forEach :

d3.json("data/data.json")
  .then(data => data
    .filter(d => d.year === 2010)
    .forEach(d => {
        ...
    })
)