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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-iterable/merge. Try it out:
const iterable = require("extra-iterable");
var x = [1, 3, 5, 7];
var y = [2, 4, 8];
[...iterable.merge([x, y])];
var y = [-2, -4, -8];
[...iterable.merge([x, y], (a, b) => Math.abs(a) - Math.abs(b))];
[...iterable.merge([x, y], null, v => Math.abs(v))];
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