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Function invocation and this
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8>" /> | |
| <script src="http://code.jquery.com/jquery-1.11.0.min.js"></script> | |
| </head> | |
| <body> | |
| <div id="div" style="cursor: pointer;"> | |
| <p>person.name</p> | |
| </div> | |
| <script> | |
| // https://yehudakatz.com/2011/08/11/understanding-javascript-function-invocation-and-this/ | |
| //Base object | |
| const person = { | |
| name: 'Dimitry Rudakov', | |
| hello: function () { | |
| console.log(this.name + ' says hello world'); | |
| }, | |
| }; | |
| $('#div').click(person.hello.bind(person)); | |
| // Bind + apply | |
| // const bind = function (func, thisValue) { | |
| // return function () { | |
| // return func.apply(thisValue, arguments); | |
| // }; | |
| // }; | |
| // var boundHello = bind(person.hello, person); | |
| // boundHello('Inna'); | |
| // // Call using object method | |
| // var boundHello = function (thing) { | |
| // return person.hello.call(person, thing); | |
| // }; | |
| // boundHello('Inna'); | |
| // //Strict mode | |
| // ('strict mode'); | |
| // let object = { | |
| // property1: 12312, | |
| // prop2: '3452345', | |
| // func: function () { | |
| // return this.property; | |
| // }, | |
| // }; | |
| // function hello(thing) { | |
| // console.log('Hello ' + thing); | |
| // } | |
| // hello('world'); | |
| // hello.call(window, 'world>>>'); | |
| // // Broken example | |
| // let deck = { | |
| // suits: ['hearts', 'spades', 'clubs', 'diamonds'], | |
| // cards: Array(52), | |
| // createCardPicker: function () { | |
| // return function () { | |
| // let pickedCard = Math.floor(Math.random() * 52); | |
| // let pickedSuit = Math.floor(pickedCard / 13); | |
| // return { | |
| // suit: this.suits[pickedSuit] /* <<< Unaccessible this */, | |
| // card: pickedCard % 13, | |
| // }; | |
| // }; | |
| // }, | |
| // }; | |
| // let cardPicker = deck.createCardPicker(); | |
| // let pickedCard = cardPicker(); | |
| // alert('card: ' + pickedCard.card + ' of ' + pickedCard.suit); | |
| </script> | |
| </body> | |
| </html> |
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