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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,45 +1,41 @@ | ||
| // This script simulates object-oriented programming (OOP) techniques | ||
| // using function pointers (Fn) and object maps. | ||
| // This script simulates object-oriented programming (OOP) techniques using closures. | ||
|
|
||
| // External variable that will be captured. | ||
| let last_value = (); | ||
|
|
||
| // Define object | ||
| let obj1 = #{ | ||
| _data: 42, // data field | ||
| get_data: Fn("getData"), // property getter | ||
| action: Fn("action"), // method | ||
| update: Fn("update1") // property setter | ||
| _data: 42, // data field | ||
| get_data: || this._data, // property getter | ||
| action: || print("Data=" + this._data), // method | ||
| update: |x| { // property setter | ||
| this._data = x; | ||
| last_value = this._data; // capture 'last_value' | ||
| this.action(); | ||
| } | ||
| }; | ||
|
|
||
| fn getData() { | ||
| this._data | ||
| } | ||
| fn action() { | ||
| print("Data=" + this._data); | ||
| } | ||
| fn update1(x) { | ||
| this._data = x; | ||
| this.action(); | ||
| } | ||
|
|
||
| if obj1.get_data() > 0 { // property access | ||
| obj1.update(123); // call method | ||
| if obj1.get_data() > 0 { // property access | ||
| obj1.update(123); // call method | ||
| } else { | ||
| print("we have a problem here"); | ||
| } | ||
|
|
||
| // Define another object based on the first object | ||
| let obj2 = #{ | ||
| _data: 0, // data field - new value | ||
| update: Fn("update2") // property setter - another function | ||
| _data: 0, // data field - new value | ||
| update: |x| { // property setter - another function | ||
| this._data = x * 2; | ||
| last_value = this._data; // capture 'last_value' | ||
| this.action(); | ||
| } | ||
| }; | ||
| obj2.fill_with(obj1); // add all other fields from obj1 | ||
|
|
||
| fn update2(x) { | ||
| this._data = x * 2; | ||
| this.action(); | ||
| } | ||
| obj2.fill_with(obj1); // add all other fields from obj1 | ||
|
|
||
| if obj2.get_data() > 0 { // property access | ||
| obj2.update(0); // call method | ||
| if obj2.get_data() > 0 { // property access | ||
| print("we have another problem here"); | ||
| } else { | ||
| obj2.update(42); // call method | ||
| obj2.update(42); // call method | ||
| } | ||
|
|
||
| print("Should be 84: " + last_value); |
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