數組Array方法之filter()、map()、sort()、reduce()

filter()方法：過濾操做，篩選出符合條件的元素，返回組成的新數組。數組 語法：array.filter(function(currentValue,index,arr)，thisValue)函數 const peoples = [ {name:'Yoona',age:26}, {name:'Jessica',age:27}, {name:'Tiffany',age:29}, {name:'K

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