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| function add(x){ | |
| let sum = x; | |
| function resultFn(y){ | |
| sum +=y; | |
| return resultFn; | |
| } | |
| resultFn.valueOf = function(){ return sum }; | |
| return resultFn; | |
| } |
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| function add(x){ | |
| return function (y){ | |
| return x+y; | |
| } | |
| } | |
| //ES6 version using arrow functions | |
| const add = x=> y=>x+y; |
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| var value = 0; //window.value | |
| Object.defineProperty(window, 'a', { | |
| get: function() { | |
| return this.value += 1; | |
| } | |
| }); | |
| console.log(a===1 && a===2 && a===3) //true |
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| const a = { value : 0 }; | |
| a.valueOf = function() { | |
| return this.value += 1; | |
| }; | |
| console.log(a==1 && a==2 && a==3); //true |
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