If I have a dictionary of arrays, for example:
samples = {
"labels": ["A", "B", "C"],
"values": [2, 3, 1]
}
How do I sort the lists by the value order? For example, the output would be:
samples = {
"labels": ["C", "A", "B"],
"values": [1, 2, 3]
}
Would I need to convert the dictionary of lists into a list of dictionaries, sort by the values, then convert back, or is there a more direct way?
You could take the indices and sort these and then get the mapped arrays by using the sorted indices.
var samples = { labels: ["A", "B", "C"], values: [2, 3, 1] },
indices = [...samples.values.keys()];
indices.sort((a, b) => samples.values[a] - samples.values[b]);
samples.labels = indices.map(i => samples.labels[i]);
samples.values = indices.map(i => samples.values[i]);
console.log(samples);.as-console-wrapper { max-height: 100% !important; top: 0; }
We can do this all in place.
First we map a new array giving us [{label, value}]
Then we sort on the value
Finally we use reduce to rebuild to our original object.
let samples = {
"labels": ["A", "B", "C"],
"values": [2, 3, 1]
}
samples = samples.labels
.map((label, i) => ({ label, value: samples.values[i] }))
.sort(({ value: a }, { value: b }) => a - b)
.reduce((a, { value, label }) => {
a.labels.push(label);
a.values.push(value);
return a;
}, { labels: [], values: []});
console.log(JSON.stringify(samples));
