\uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\uc5d0\uc11c \ub370\uc774\ud130 \ucee8\ud14c\uc774\ub108\ub85c\uc368\uc758 \uad00\uc810\uc5d0\uc11c \ub370\uc774\ud130\ub97c \uc21c\ud68c\ud558\ub294 \ucf54\ub4dc\ub97c \uc815\ub9ac\ud569\ub2c8\ub2e4.<\/p>\n
\uba3c\uc800 Array\uc785\ub2c8\ub2e4.<\/p>\n
\r\nconst arr = new Array(1, 2, 3, 4, 5)\r\n\r\nconsole.log('Array Iteration 1')\r\nfor (let i = 0; i < arr.length; i++) {\r\n console.log(arr[i])\r\n}\r\n\r\nconsole.log('Array Iteration 2')\r\narr.forEach(v => {\r\n console.log(v)\r\n})\r\n\r\nconsole.log('Array Iteration 3')\r\nfor (let v of arr) {\r\n console.log(v)\r\n}\r\n\r\nconsole.log('Array Iteration 4')\r\nfor (let i in arr) {\r\n console.log(arr[i])\r\n}\r\n<\/pre>\n\ub2e4\uc74c\uc740 Set\uc785\ub2c8\ub2e4.<\/p>\n
\r\nconst set = new Set([1, 2, 3, 4, 'Hello'])\r\n\r\nconsole.log('Set Iteration 1')\r\nfor (let v of set) {\r\n console.log(v)\r\n}\r\n\r\nconsole.log('Set Iteration 2')\r\nfor (let v of set.values()) {\r\n console.log(v)\r\n}\r\n\r\nconsole.log('Set Iteration 3')\r\nset.forEach(v => {\r\n console.log(v)\r\n});\r\n<\/pre>\n\ub2e4\uc74c\uc740 Object\uc785\ub2c8\ub2e4.<\/p>\n
\r\nconst obj = { a: 1, b: 2, c: 3, 9: 4, e: 'Hello' }\r\n\r\nconsole.log('Object Iteration 1')\r\nconst keys = Object.keys(obj) \/\/ [ 'a', 'b', 'c', '9', 'e' ]\r\n\r\nfor (let i = 0; i < keys.length; i++) {\r\n const k = keys[i]\r\n const v = obj[k]\r\n console.log(k, v)\r\n}\r\n\r\nconsole.log('Object Iteration 2')\r\nconst values = Object.values(obj) \/\/ [ 1, 2, 3, 4, 'Hello' ]\r\nfor (let i = 0; i < values.length; i++) {\r\n const v = values[i]\r\n console.log(v)\r\n}\r\n\r\nconsole.log('Object Iteration 3')\r\nconst entries = Object.entries(obj) \/\/ [ ['a', 1], ['b', 2], ['c', 3], ['9', 4], ['e', 'Hello'] ]\r\nfor (let i = 0; i < entries.length; i++) {\r\n const k = entries[i][0]\r\n const v = entries[i][1]\r\n\r\n console.log(k, v)\r\n}\r\n\r\nconsole.log('Object Iteration 4')\r\nfor (let k in obj) {\r\n const v = obj[k]\r\n console.log(k, v)\r\n}\r\n<\/pre>\n\ub05d\uc73c\ub85c Map\uc785\ub2c8\ub2e4.<\/p>\n
\r\nconst map = new Map( [ ['a', 1], ['b', 2], ['c', 3], ['9', 4], ['e', 'Hello'] ])\r\n\r\nconsole.log('Map Iteration 1')\r\nfor (let [k, v] of map) {\r\n console.log(k, v)\r\n}\r\n\r\nconsole.log('Map Iteration 2')\r\nfor (let k of map.keys()) {\r\n console.log(k, map.get(k))\r\n}\r\n\r\nconsole.log('Map Iteration 3')\r\nfor (let v of map.values()) {\r\n console.log(v)\r\n}\r\n\r\nconsole.log('Map Iteration 4')\r\nfor (let [k, v] of map.entries()) {\r\n console.log(k, v)\r\n}\r\n\r\nconsole.log('Map Iteration 5')\r\nmap.forEach(function(v, k) {\r\n console.log(k, v)\r\n})\r\n<\/pre>\n\uc0ac\uc2e4 Map\uc758 \ucd9c\ud604\uc73c\ub85c \ub354 \uc774\uc0c1 Object\ub97c \ub370\uc774\ud130 \ucee8\ud14c\uc774\ub108\ub85c\uc368 \uc0ac\uc6a9\ud558\ub294 \uac83\uc740 \uc633\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. Object\ub294 \uae30\ubcf8\uc801\uc73c\ub85c \uc0dd\uc131\ub420 \ub54c \uae30\ubcf8 \ud0a4\uac12\uc744 \uac16\uc9c0\ub9cc Map\uc740 \uac1c\ubc1c\uc790\uac00 \ucd94\uac00\ud558\uc9c0 \uc54a\uc740 \ub370\uc774\ud130\ub294 \uac16\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \ub610\ud55c Map\uc758 Key\ub294 \ubb38\uc790\uc5f4 \uac1d\uccb4 \uc774\uc678\uc5d0\ub3c4 \ud0c0\uc785\ub3c4 \uac00\ub2a5\ud569\ub2c8\ub2e4. \ub610\ud55c \uc800\uc7a5\ud55c \uc21c\uc11c\ub300\ub85c \uac12\uc744 \uc5bb\uc744 \uc218 \uc788\uc73c\uba70 \ub370\uc774\ud130\uc758 \uac1c\uc218\ub3c4 size \ud568\uc218\ub97c \ud1b5\ud574 \ubc14\ub85c \uc5bb\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uac8c\ub2e4\uac00 Map\uc740 \ub370\uc774\ud130\uc758 \ucd94\uac00\uc640 \uc0ad\uc81c \uc2dc Object\ubcf4\ub2e4 \uc131\ub2a5\uc774 \ub6f0\uc5b4\ub0a9\ub2c8\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"
\uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\uc5d0\uc11c \ub370\uc774\ud130 \ucee8\ud14c\uc774\ub108\ub85c\uc368\uc758 \uad00\uc810\uc5d0\uc11c \ub370\uc774\ud130\ub97c \uc21c\ud68c\ud558\ub294 \ucf54\ub4dc\ub97c \uc815\ub9ac\ud569\ub2c8\ub2e4. \uba3c\uc800 Array\uc785\ub2c8\ub2e4. const arr = new Array(1, 2, 3, 4, 5) console.log(‘Array Iteration 1’) for (let i = 0; i < arr.length; i++) { console.log(arr[i]) } console.log('Array Iteration 2') arr.forEach(v => { console.log(v) }) console.log(‘Array Iteration 3’) for (let v of arr) { console.log(v) } console.log(‘Array Iteration … <\/p>\n