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Limitations With ArrayArrays don't enforce uniqueness of items. Diplicate entries are allowed.Using Setslet tags = new Set() ;tags.add('Javascript');t... 阅读全文
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WeakMap: is a type of Map where only objects can be passed as keys. Primitive data type -- such are string, numbers, booleans, etc --- are not allowed... 阅读全文
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Use Maps when keys are unknown until runtime:Map:let recentPosts = new Map();createPost( newPost, (data)=>{ // Key unknown until runtime, so use Ma... 阅读全文
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A common problem when dealing with some kinds of data is that not every object has the same nested structure. lukeskywalker.parents.father.isjedi work... 阅读全文