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June 6, 2018 17:14
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node-workshop 02
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| // Array Method | |
| var data = ['A', 'B', 'C', 'D'] | |
| // push | |
| // เพิ่มสมาชิกต่อท้าย array | |
| data.push('E') | |
| console.log(data) | |
| // ['A', 'B', 'C', 'D', 'E'] | |
| // pop | |
| // ลบสมาชิกตัวสุดท้ายออก | |
| var x = data.pop() | |
| console.log(data) | |
| // ['A', 'B', 'C', 'D'] | |
| // shift | |
| // ลบสมาชิกตัวสุดแรกออก | |
| var y = data.shift() | |
| console.log(data) | |
| // ['B', 'C', 'D'] | |
| // unshift | |
| // แทรกสมาชิกตัวสุดแรก | |
| data.unshift('X') | |
| console.log(data) | |
| // ['X', 'B', 'C', 'D'] | |
| // splice | |
| // ใช้สำหรับแก้ไข Array โดยระบุ | |
| // Array.splice(start, deleteCount, item1, ....., itemX) | |
| // start = ตำแหน่ง | |
| // deleteCount = จำนวนสมาชิกที่ต้องการลบ | |
| // item1, item2, ... = สมาชิกที่ต้องการลบ | |
| var data2 = ['A', 'B', 'C', 'D'] | |
| // ตำแหน่ง 0 = A, 1 = B, 2 = C, 3 = D | |
| // ลบ C ออก | |
| console.log((data2.splice(2,1)) | |
| // ABD | |
| console.log((data2.splice(1,1)) | |
| // ACD | |
| console.log((data2.splice(1,5)) | |
| // A | |
| // แทรก X ระหว่าง B กับ C | |
| console.log((data2.splice(2,0,'X')) | |
| // ABXCD | |
| // ----- | |
| console.log((data2.splice(2,1,'X')) | |
| // ABXD | |
| console.log(data2.splice(data2.length, 0, 'E')) | |
| // ABCDE | |
| console.log(data2.splice(data2.length-1, 1)) | |
| // ABC | |
| console.log(data2.splice(0,1)) | |
| // BCD | |
| console.log(data2.splice(0,1)) | |
| // XABCD |
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