我Array.prototype.map()该如何使用这种数据结构：
[
{text: "sometext", tags: ["t1", "t2", "t3"]},
{text: "sometext2", tags: ["t4", "t5", "t6"]}
]
变成这个数据结构？
[
{tag: "t1", text: "sometext"},
{tag: "t2", text: "sometext"},
{tag: "t3", text: "sometext"},
{tag: "t4", text: "sometext2"},
{tag: "t5", text: "sometext2"},
{tag: "t6", text: "sometext2"}
]
您可以（即将进行）Array#flatMap并映射内部数组。
var data = [{ text: "sometext", tags: ["t1", "t2", "t3"] }, { text: "sometext2", tags: ["t4", "t5", "t6"] }],
result = data.flatMap(({ text, tags }) => tags.map(tag => ({ tag, text })));
console.log(result);.as-console-wrapper { max-height: 100% !important; top: 0; }的结果Array#reduce。
var data = [{ text: "sometext", tags: ["t1", "t2", "t3"] }, { text: "sometext2", tags: ["t4", "t5", "t6"] }],
result = data.reduce((r, { text, tags }) => [...r, ...tags.map(tag => ({ tag, text }))], []);
console.log(result);.as-console-wrapper { max-height: 100% !important; top: 0; }本文收集自互联网，转载请注明来源。
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