How to use Object.defineProperties()?
Below I am trying to define properties of an object using defineProperties function, but I am getting unexpected outcome when I print last line in this script. I expect 2005 to be logged at console, but I keep getting 2004. Same applies to other properties, like edition. Am I using this defineProperties
function incorrectly?
var book = {};
Object.defineProperties(book, {
_year: {
value: 2004
},
edition: {
value: 1
},
year: {
get: function() {
return this._year;
},
set: function(newValue) {
if (newValue > 2004) {
this._year = newValue;
this.edition += newValue - 2004;
}
}
}
});
console.log(book);
console.log(book.year);
book.year = 2005;
console.log(book);
console.log(book.year);javascript
edited Nov 13 '18 at 19:10
Felix Kling
550k126858913
asked Nov 13 '18 at 19:09
MohitMohit
1238
add a comment |
Below I am trying to define properties of an object using defineProperties function, but I am getting unexpected outcome when I print last line in this script. I expect 2005 to be logged at console, but I keep getting 2004. Same applies to other properties, like edition. Am I using this defineProperties
function incorrectly?
var book = {};
Object.defineProperties(book, {
_year: {
value: 2004
},
edition: {
value: 1
},
year: {
get: function() {
return this._year;
},
set: function(newValue) {
if (newValue > 2004) {
this._year = newValue;
this.edition += newValue - 2004;
}
}
}
});
console.log(book);
console.log(book.year);
book.year = 2005;
console.log(book);
console.log(book.year);javascript
edited Nov 13 '18 at 19:10
Felix Kling
550k126858913
asked Nov 13 '18 at 19:09
MohitMohit
1238
The default value for thewritableflag isfalse. You have to explicitly set it totrue. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Felix Kling
Nov 13 '18 at 19:13
add a comment |
Below I am trying to define properties of an object using defineProperties function, but I am getting unexpected outcome when I print last line in this script. I expect 2005 to be logged at console, but I keep getting 2004. Same applies to other properties, like edition. Am I using this defineProperties
function incorrectly?
var book = {};
Object.defineProperties(book, {
_year: {
value: 2004
},
edition: {
value: 1
},
year: {
get: function() {
return this._year;
},
set: function(newValue) {
if (newValue > 2004) {
this._year = newValue;
this.edition += newValue - 2004;
}
}
}
});
console.log(book);
console.log(book.year);
book.year = 2005;
console.log(book);
console.log(book.year);javascript
edited Nov 13 '18 at 19:10
Felix Kling
550k126858913
asked Nov 13 '18 at 19:09
MohitMohit
1238
Below I am trying to define properties of an object using defineProperties function, but I am getting unexpected outcome when I print last line in this script. I expect 2005 to be logged at console, but I keep getting 2004. Same applies to other properties, like edition. Am I using this defineProperties
function incorrectly?
var book = {};
Object.defineProperties(book, {
_year: {
value: 2004
},
edition: {
value: 1
},
year: {
get: function() {
return this._year;
},
set: function(newValue) {
if (newValue > 2004) {
this._year = newValue;
this.edition += newValue - 2004;
}
}
}
});
console.log(book);
console.log(book.year);
book.year = 2005;
console.log(book);
console.log(book.year);var book = {};
Object.defineProperties(book, {
_year: {
value: 2004
},
edition: {
value: 1
},
year: {
get: function() {
return this._year;
},
set: function(newValue) {
if (newValue > 2004) {
this._year = newValue;
this.edition += newValue - 2004;
}
}
}
});
console.log(book);
console.log(book.year);
book.year = 2005;
console.log(book);
console.log(book.year);var book = {};
Object.defineProperties(book, {
_year: {
value: 2004
},
edition: {
value: 1
},
year: {
get: function() {
return this._year;
},
set: function(newValue) {
if (newValue > 2004) {
this._year = newValue;
this.edition += newValue - 2004;
}
}
}
});
console.log(book);
console.log(book.year);
book.year = 2005;
console.log(book);
console.log(book.year);javascript
javascript
edited Nov 13 '18 at 19:10
Felix Kling
550k126858913
asked Nov 13 '18 at 19:09
MohitMohit
1238
edited Nov 13 '18 at 19:10
Felix Kling
550k126858913
asked Nov 13 '18 at 19:09
MohitMohit
1238
edited Nov 13 '18 at 19:10
Felix Kling
550k126858913
edited Nov 13 '18 at 19:10
Felix Kling
550k126858913
edited Nov 13 '18 at 19:10
Felix Kling
550k126858913
550k126858913
asked Nov 13 '18 at 19:09
MohitMohit
1238
asked Nov 13 '18 at 19:09
MohitMohit
1238
asked Nov 13 '18 at 19:09
MohitMohit
1238
1238
The default value for thewritableflag isfalse. You have to explicitly set it totrue. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Felix Kling
Nov 13 '18 at 19:13
add a comment |
The default value for thewritableflag isfalse. You have to explicitly set it totrue. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Felix Kling
Nov 13 '18 at 19:13
The default value for the
writable flag is false. You have to explicitly set it to true. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…– Felix Kling
Nov 13 '18 at 19:13
The default value for the
writable flag is false. You have to explicitly set it to true. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…– Felix Kling
Nov 13 '18 at 19:13
add a comment |
1 Answer
1
active
oldest
votes
You defined _year as read only, so this._year = newValue fails (silently). You need to make it writable.
_year: {
value: 2004,
writable: true
},
answered Nov 13 '18 at 19:12
QuentinQuentin
645k718701038
Same foredition.
– Felix Kling
Nov 13 '18 at 19:13
Dang, missed that. Thank you guys.
– Mohit
Nov 13 '18 at 19:14
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You defined _year as read only, so this._year = newValue fails (silently). You need to make it writable.
_year: {
value: 2004,
writable: true
},
answered Nov 13 '18 at 19:12
QuentinQuentin
645k718701038
Same foredition.
– Felix Kling
Nov 13 '18 at 19:13
Dang, missed that. Thank you guys.
– Mohit
Nov 13 '18 at 19:14
add a comment |
You defined _year as read only, so this._year = newValue fails (silently). You need to make it writable.
_year: {
value: 2004,
writable: true
},
answered Nov 13 '18 at 19:12
QuentinQuentin
645k718701038
Same foredition.
– Felix Kling
Nov 13 '18 at 19:13
Dang, missed that. Thank you guys.
– Mohit
Nov 13 '18 at 19:14
add a comment |
You defined _year as read only, so this._year = newValue fails (silently). You need to make it writable.
_year: {
value: 2004,
writable: true
},
answered Nov 13 '18 at 19:12
QuentinQuentin
645k718701038
You defined _year as read only, so this._year = newValue fails (silently). You need to make it writable.
_year: {
value: 2004,
writable: true
},
answered Nov 13 '18 at 19:12
QuentinQuentin
645k718701038
answered Nov 13 '18 at 19:12
QuentinQuentin
645k718701038
answered Nov 13 '18 at 19:12
QuentinQuentin
645k718701038
answered Nov 13 '18 at 19:12
QuentinQuentin
645k718701038
645k718701038
Same foredition.
– Felix Kling
Nov 13 '18 at 19:13
Dang, missed that. Thank you guys.
– Mohit
Nov 13 '18 at 19:14
add a comment |
Same foredition.
– Felix Kling
Nov 13 '18 at 19:13
Dang, missed that. Thank you guys.
– Mohit
Nov 13 '18 at 19:14
Same for
edition.– Felix Kling
Nov 13 '18 at 19:13
Same for
edition.– Felix Kling
Nov 13 '18 at 19:13
Dang, missed that. Thank you guys.
– Mohit
Nov 13 '18 at 19:14
Dang, missed that. Thank you guys.
– Mohit
Nov 13 '18 at 19:14
add a comment |
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The default value for the
writableflag isfalse. You have to explicitly set it totrue. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…– Felix Kling
Nov 13 '18 at 19:13