Array prototype is read only, properties should not be added no-extend-native
So basically I have this code:
Array.prototype.inState = function (needle, haystack) {
let index = this.findIndex(value => value[needle] === haystack);
return index === -1;
};
and it works fairly enough to check if the given needle is exists in the react state or not. but ESlint keep saying that:
Array prototype is read only, properties should not be added no-extend-native
so my question is: What is wrong with my code ?
javascript reactjs eslint
asked Nov 20 at 7:02
AH.Pooladvand
37010
add a comment |
So basically I have this code:
Array.prototype.inState = function (needle, haystack) {
let index = this.findIndex(value => value[needle] === haystack);
return index === -1;
};
and it works fairly enough to check if the given needle is exists in the react state or not. but ESlint keep saying that:
Array prototype is read only, properties should not be added no-extend-native
so my question is: What is wrong with my code ?
javascript reactjs eslint
asked Nov 20 at 7:02
AH.Pooladvand
37010
add a comment |
So basically I have this code:
Array.prototype.inState = function (needle, haystack) {
let index = this.findIndex(value => value[needle] === haystack);
return index === -1;
};
and it works fairly enough to check if the given needle is exists in the react state or not. but ESlint keep saying that:
Array prototype is read only, properties should not be added no-extend-native
so my question is: What is wrong with my code ?
javascript reactjs eslint
asked Nov 20 at 7:02
AH.Pooladvand
37010
So basically I have this code:
Array.prototype.inState = function (needle, haystack) {
let index = this.findIndex(value => value[needle] === haystack);
return index === -1;
};
and it works fairly enough to check if the given needle is exists in the react state or not. but ESlint keep saying that:
Array prototype is read only, properties should not be added no-extend-native
so my question is: What is wrong with my code ?
javascript reactjs eslint
javascript reactjs eslint
asked Nov 20 at 7:02
AH.Pooladvand
37010
asked Nov 20 at 7:02
AH.Pooladvand
37010
asked Nov 20 at 7:02
AH.Pooladvand
37010
asked Nov 20 at 7:02
AH.Pooladvand
37010
asked Nov 20 at 7:02
AH.Pooladvand
37010
37010
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
From EsLint Docs:
In JavaScript, you can extend any object, including builtin or
“native” objects. Sometimes people change the behavior of these native
objects in ways that break the assumptions made about them in other
parts of the code.
For example here we are overriding a builtin method that will then
affect all Objects, even other builtin.
// seems harmless
Object.prototype.extra = 55;
// loop through some userIds
var users = {
"123": "Stan",
"456": "David"
};
// not what you'd expect
for (var id in users) {
console.log(id); // "123", "456", "extra"
}
In-short, Array.prototype.inState will extend the array.prototype and hence whenever you want to use an array, the instate function will be added to that array too.
So, in your case this example will be applied to array.
Array.prototype.inState = function (needle, haystack) {
let index = this.findIndex(value => value[needle] === haystack);
return index === -1;
};
// loop through some userIds
var users = [{"123": "Stan"},{"456": "David"}];
// not what you'd expect
for (var id in users) {
console.log(users[id]); // "123", "456", "extra"
}WorkAround
You can add this line to ignore warning.
/*eslint no-extend-native: ["error", { "exceptions": ["Object"] }]*/ to ignore that warning.
Ref: https://eslint.org/docs/rules/no-extend-native
answered Nov 20 at 7:08
Just code
7,96642966
@AH.Pooladvand this would be a good conversion developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Just code
Nov 20 at 7:54
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
From EsLint Docs:
In JavaScript, you can extend any object, including builtin or
“native” objects. Sometimes people change the behavior of these native
objects in ways that break the assumptions made about them in other
parts of the code.
For example here we are overriding a builtin method that will then
affect all Objects, even other builtin.
// seems harmless
Object.prototype.extra = 55;
// loop through some userIds
var users = {
"123": "Stan",
"456": "David"
};
// not what you'd expect
for (var id in users) {
console.log(id); // "123", "456", "extra"
}
In-short, Array.prototype.inState will extend the array.prototype and hence whenever you want to use an array, the instate function will be added to that array too.
So, in your case this example will be applied to array.
Array.prototype.inState = function (needle, haystack) {
let index = this.findIndex(value => value[needle] === haystack);
return index === -1;
};
// loop through some userIds
var users = [{"123": "Stan"},{"456": "David"}];
// not what you'd expect
for (var id in users) {
console.log(users[id]); // "123", "456", "extra"
}WorkAround
You can add this line to ignore warning.
/*eslint no-extend-native: ["error", { "exceptions": ["Object"] }]*/ to ignore that warning.
Ref: https://eslint.org/docs/rules/no-extend-native
answered Nov 20 at 7:08
Just code
7,96642966
@AH.Pooladvand this would be a good conversion developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Just code
Nov 20 at 7:54
add a comment |
From EsLint Docs:
In JavaScript, you can extend any object, including builtin or
“native” objects. Sometimes people change the behavior of these native
objects in ways that break the assumptions made about them in other
parts of the code.
For example here we are overriding a builtin method that will then
affect all Objects, even other builtin.
// seems harmless
Object.prototype.extra = 55;
// loop through some userIds
var users = {
"123": "Stan",
"456": "David"
};
// not what you'd expect
for (var id in users) {
console.log(id); // "123", "456", "extra"
}
In-short, Array.prototype.inState will extend the array.prototype and hence whenever you want to use an array, the instate function will be added to that array too.
So, in your case this example will be applied to array.
Array.prototype.inState = function (needle, haystack) {
let index = this.findIndex(value => value[needle] === haystack);
return index === -1;
};
// loop through some userIds
var users = [{"123": "Stan"},{"456": "David"}];
// not what you'd expect
for (var id in users) {
console.log(users[id]); // "123", "456", "extra"
}WorkAround
You can add this line to ignore warning.
/*eslint no-extend-native: ["error", { "exceptions": ["Object"] }]*/ to ignore that warning.
Ref: https://eslint.org/docs/rules/no-extend-native
answered Nov 20 at 7:08
Just code
7,96642966
@AH.Pooladvand this would be a good conversion developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Just code
Nov 20 at 7:54
add a comment |
From EsLint Docs:
In JavaScript, you can extend any object, including builtin or
“native” objects. Sometimes people change the behavior of these native
objects in ways that break the assumptions made about them in other
parts of the code.
For example here we are overriding a builtin method that will then
affect all Objects, even other builtin.
// seems harmless
Object.prototype.extra = 55;
// loop through some userIds
var users = {
"123": "Stan",
"456": "David"
};
// not what you'd expect
for (var id in users) {
console.log(id); // "123", "456", "extra"
}
In-short, Array.prototype.inState will extend the array.prototype and hence whenever you want to use an array, the instate function will be added to that array too.
So, in your case this example will be applied to array.
Array.prototype.inState = function (needle, haystack) {
let index = this.findIndex(value => value[needle] === haystack);
return index === -1;
};
// loop through some userIds
var users = [{"123": "Stan"},{"456": "David"}];
// not what you'd expect
for (var id in users) {
console.log(users[id]); // "123", "456", "extra"
}WorkAround
You can add this line to ignore warning.
/*eslint no-extend-native: ["error", { "exceptions": ["Object"] }]*/ to ignore that warning.
Ref: https://eslint.org/docs/rules/no-extend-native
answered Nov 20 at 7:08
Just code
7,96642966
From EsLint Docs:
In JavaScript, you can extend any object, including builtin or
“native” objects. Sometimes people change the behavior of these native
objects in ways that break the assumptions made about them in other
parts of the code.
For example here we are overriding a builtin method that will then
affect all Objects, even other builtin.
// seems harmless
Object.prototype.extra = 55;
// loop through some userIds
var users = {
"123": "Stan",
"456": "David"
};
// not what you'd expect
for (var id in users) {
console.log(id); // "123", "456", "extra"
}
In-short, Array.prototype.inState will extend the array.prototype and hence whenever you want to use an array, the instate function will be added to that array too.
So, in your case this example will be applied to array.
Array.prototype.inState = function (needle, haystack) {
let index = this.findIndex(value => value[needle] === haystack);
return index === -1;
};
// loop through some userIds
var users = [{"123": "Stan"},{"456": "David"}];
// not what you'd expect
for (var id in users) {
console.log(users[id]); // "123", "456", "extra"
}WorkAround
You can add this line to ignore warning.
/*eslint no-extend-native: ["error", { "exceptions": ["Object"] }]*/ to ignore that warning.
Ref: https://eslint.org/docs/rules/no-extend-native
Array.prototype.inState = function (needle, haystack) {
let index = this.findIndex(value => value[needle] === haystack);
return index === -1;
};
// loop through some userIds
var users = [{"123": "Stan"},{"456": "David"}];
// not what you'd expect
for (var id in users) {
console.log(users[id]); // "123", "456", "extra"
}Array.prototype.inState = function (needle, haystack) {
let index = this.findIndex(value => value[needle] === haystack);
return index === -1;
};
// loop through some userIds
var users = [{"123": "Stan"},{"456": "David"}];
// not what you'd expect
for (var id in users) {
console.log(users[id]); // "123", "456", "extra"
}answered Nov 20 at 7:08
Just code
7,96642966
edited Nov 20 at 7:14
answered Nov 20 at 7:08
Just code
7,96642966
answered Nov 20 at 7:08
Just code
7,96642966
answered Nov 20 at 7:08
Just code
7,96642966
7,96642966
@AH.Pooladvand this would be a good conversion developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Just code
Nov 20 at 7:54
add a comment |
@AH.Pooladvand this would be a good conversion developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Just code
Nov 20 at 7:54
@AH.Pooladvand this would be a good conversion developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Just code
Nov 20 at 7:54
@AH.Pooladvand this would be a good conversion developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Just code
Nov 20 at 7:54
add a comment |
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