4.1 done
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4.1object/index.html
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4.1object/index.html
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<!DOCTYPE html>
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<head>
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</head>
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<body>
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<!-- <script src="t1.js"></script> -->
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<!-- <script src="t2.js"></script> -->
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<!-- <script src="t3.js"></script> -->
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<!-- <script src="t4.js"></script> -->
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</body>
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4.1object/t1.js
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4.1object/t1.js
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let user = {};
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for(key in user) alert(key, user[key]);
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user["name"] = "John"
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for(key in user) alert(key, user[key]);
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user["surname"] = "Smith"
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for(key in user) alert(key, user[key]);
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user["name"] = "Pete"
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for(key in user) alert(key, user[key]);
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delete user["name"];
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for(key in user) alert(key, user[key]);
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12
4.1object/t2.js
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4.1object/t2.js
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function isEmpty(obj){
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let flag = 0;
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for(key in obj){
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flag = 1;
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}
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return flag == 0 ? false : true;
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}
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let schedule = {};
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alert(isEmpty(schedule));
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schedule["9:30"] = "get up"
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alert(isEmpty(schedule));
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4.1object/t3.js
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4.1object/t3.js
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let salaries = {
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John : 100,
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Ann : 160,
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Pete: 130
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};
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let sum = 0;
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for(pname in salaries){
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sum += salaries[pname];
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}
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alert(sum)
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4.1object/t4.js
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4.1object/t4.js
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// before the call
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let menu = {
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width: 200,
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height: 300,
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title: "My menu"
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};
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multiplyNumeric(menu);
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// after the call
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menu = {
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width: 400,
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height: 600,
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title: "My menu"
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};
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function multiplyNumeric(menu){
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for(prop in menu){
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if(typeof menu[prop] == 'number'){
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menu[prop] *= 2;
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}
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}
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}
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