I'm having an issue trying to assign a key to elements on a d3 map. Despite using a key function, the keys are still showing as 0, 1, 2, etc. What mistake am I making?
d3.csv("data/words.csv").then(function(data) {
// clean data
const formattedData = data.map(yearWord => {
//yearWord.key = yearWord.year + ":" + yearWord.word
yearWord.count = Number(yearWord.count)
return yearWord
}, function(d) { return d.year + ":" + d.word; })
Not a d3.map, but rather Array.prototype.map; there is no key function here. Transform your data into an object like this:
data.reduce((obj, {year, word, count }) => {
obj[`${year}:${word}`] = Number(count);
}, {});
This will generate an object with the structure { "2020:pandemic": 9001 }. You can then retrieve all keys using Object.keys(myObject).
To define a key value pair, follow these steps:
let dictionary = d3.map({"Apple": 5, "Banana": 10, "Orange": 15});
allKeys = dictionary.keys();
console.log(allKeys);
You can potentially pass the data value directly to the d3.map() method, although additional setup may be required based on the format of the data.
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