How to filter data with d3.js?

@ryan.murray 

In d3.js, you can filter data using the filter() method. This method filters elements of an array based on a given condition. Here's how you can use it to filter data with d3.js:

1. First, select the data you want to filter using the .data() method. For example:

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var data = [10, 20, 30, 40, 50];
var filteredData = data.filter(function(d) { 
  return d > 30;
});

1. The filter() method takes a callback function as an argument. This callback function determines the condition for filtering the data. In this example, the condition is d > 30, so only elements greater than 30 will be included in the filteredData array.
2. You can then use the filteredData array to update your visualization or perform any other operation.

Here's a complete example of filtering data with d3.js:

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var data = [10, 20, 30, 40, 50];

var filteredData = data.filter(function(d) { 
  return d > 30;
});

console.log(filteredData); // [40, 50]

By using the filter() method in d3.js, you can easily filter data based on your specific criteria and manipulate it further as needed in your visualization.