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Es6 (ES 2015) (Collection (Map(value, key) (loop (Value: for (let value of…
Es6 (ES 2015)
Collection
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Map(value, key)
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loop
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for(let [key, value] of MapObject)
mapObject.forEach( (key, value) => {} ) :warning:
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WeakMap: like MAP :no_entry: but just use object, class, function to be a Key
WeakSet: like Set:no_entry: but just use object, class, function to be a value(key)
Object
property
es5: { first: first}, es6: {first}
function in object:
es5: {add: function(a,b){}}
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var copy = Object.assign({}, obj);
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