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                # 數組其它方法 ## 常用操作 push、unshift、shift、pop、slice、splice、concat ## 新增迭代方法 forEach、map、filter、reduce(很強) ``` var arr = [1,2,3,4]; arr.forEach(function (item,index) { console.log(item,index) }) var newarr = arr.map(function(item,index){ console.log(item) return item+1; }) console.log(arr,newarr) var newarr = arr.filter(function(item,index){ if(item>2){ return item; } }) console.log(arr,newarr) //reduce很強 var num = arr.reduce(function(a,b){ return a+b },0) console.log(num) ``` ## reduce函數的高級用法(私下去看) [https://www.jianshu.com/p/e375ba1cfc47](https://www.jianshu.com/p/e375ba1cfc47)
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