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@extra-array/unique

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const array = require("extra-array"); var x = [1, 2, 3, 4, 2, 3]; array.unique(x); var x = [1, 2, 3, 4, -2, -3]; array.unique(x, (a, b) => Math.abs(a) - Math.abs(b)); array.unique(x, null, v => Math.abs(v));