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This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including @extra-array/group. Try it out:
const array = require("extra-array");
var x = [1, 2, 2, -2, -2, 4];
array.group(x);
array.group(x, (a, b) => Math.abs(a) - Math.abs(b));
array.group(x, null, v => Math.abs(v));
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