现代 JavaScript 教程（The Modern JavaScript Tutorial），以最新的 ECMAScript 规范为基准，通过简单但足够详细的内容，为你讲解从基础到高阶的 JavaScript 相关知识。
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describe("concat", function() {
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let chunks = [
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new Uint8Array([0, 1, 2]),
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new Uint8Array([3, 4, 5]),
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new Uint8Array([6, 7, 8])
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];
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it("result has the same array type", function() {
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let result = concat(chunks);
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assert.equal(result.constructor, Uint8Array);
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});
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it("concatenates arrays", function() {
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let result = concat(chunks);
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assert.deepEqual(result, new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8]));
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});
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it("returns empty array on empty input", function() {
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let result = concat([]);
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assert.equal(result.length, 0);
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});
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});
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