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7주 JavaScript Part2
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- 131. O b je c t
- 132. var myCar =new Object();! 소스코드 참고 : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects?redirectlocale=en-USredirectslug=JavaScript%2FGuide %2FWorking_with_Objects myCar[make] = Ford;! myCar[model] = Mustang;! myCar[year] = 1969;! myCar.make = Ford;! myCar.model = Mustang;! myCar.year = 1969;!
- 133. var myCar ={};! 소스코드 참고 : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects?redirectlocale=en-USredirectslug=JavaScript%2FGuide %2FWorking_with_Objects myCar[make] = Ford;! myCar[model] = Mustang;! myCar[year] = 1969;! myCar.make = Ford;! myCar.model = Mustang;! myCar.year = 1969;! 자주쓰는
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- 137. (Iterating) for ( vari in myCar) {! console.log('key : ' + i + ', ' + 'value : ' + myCar[i]);! }! //result! key : make, value : Ford! key : model, value : Mustang! # 참고. hasOwnProperty() 메소드를 통해서 좀더 효율적인 객체의 원소를 순회할 수 있습니다. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty
- 138. delete! myCar.make = null;( 틀린 방법 )! myCar.make = undefined; ( 틀린 방법 )! ! delete myCar.make; ( 올바른 방법 )!
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- 151. obj = { name : ‘javascript’, age : 14, type : ‘dynamic’ };
- 152. A r ra y
- 153. var myCar =new Array();! var myCar = Array();! var myCar = new Array(2);! var myCar = Array(2);!
- 154. var myCar =new Array(2);! var myCar = new Array(‘2’);! 그러나..
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- 160. var myCar =[]; var myCar = [1,2,3,‘apple’]; 자주쓰는
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- 163. var myCar =[];! ! myCar.length = 10000;! ! console.log(myCar.length);! Javascript
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- 181. var colors =['red', 'green', 'blue'];! ! for (var i = 0; i colors.length; i++) {! console.log(colors[i]);! }! Array
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- 184. var a = ['a', 'b', 'c']; a.forEach(function(item){ console.log(item); }); easy
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- 192. var a = ['a', 'b', 'c']; var result = a.map(function(item){ return item+item; }); ! console.log(result); easy
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- 203. var a = [123,421,3,31,24,55,32]; var result = a.filter(function(item){ return item % 2 ===0; }); ! console.log(result); easy
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- 226. var arr =[23,-2,23.4 , “324”, 333, 34, 1000,20]; userFunction(arr); // [-2, 34, 1000, 20]
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