Retrieving the maximum values from JSON data using D3

Currently, I am working with D3 and JSON data by using a function that looks like this:

 d3.json("http://api.json", function(jsondata) {
 var data = jsondata.map(function(d) { return d.number; });

After executing this, the value of the data becomes ["2", "5", "8", "12"]

However, when I try to find the maximum value using: 

var x = d3.scale.linear()
.domain([0, d3.max(data)])

The maximum value returned is 8 instead of 12, which is the actual maximum value in the data. I understand that this is because 8 is greater than 1 in 12, but I am unsure how to resolve this issue. Any guidance would be greatly appreciated. Thank you!

javascriptjsonscaled3.js

Answer №1

According to the API reference, d3.max returns the highest value based on the natural order. When calculating the maximum value in an array of strings, lexicographic (alphabetical) order is used. For example:

console.log("8" > "12"); // true
console.log(8 > 12); // false

If you intend to find the numeric maximum in an array, it is advisable to convert those strings into numbers first. One way to do this is by using the unary + operator:

var data = jsondata.map(function(d) { return +d.number; });

Alternatively, you can utilize methods like parseFloat, parseInt, Number, or others to convert strings to numbers. While technically possible to perform this conversion within the d3.max call (d3.max(data, Number)), it is generally more efficient and safer to convert explicitly.

Moreover, considering you are already utilizing JSON and JSON is a typed serialization format, storing numbers as numbers in JSON instead of strings may be a more sensible approach, eliminating the need for type coercion.

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