redux reselect fat arrow function argument with assigning
i am new to redux and es6. I m little confused with below fat arrow function. I know fat arrow function. But What this ( record = EMPTY_OBJECT ) does? are we assigning default value(Empty Object) if no arguments found ?
const EMPTY_OBJECT = {};
this.getSelectedUser = Reselect.createSelector(
this.getUserRecords,
(record = EMPTY_OBJECT) => record.selectedUser || EMPTY_OBJECT
);
javascript ecmascript-6 reselect
asked Nov 21 '18 at 14:05
MunnaMunna
70411128
add a comment |
i am new to redux and es6. I m little confused with below fat arrow function. I know fat arrow function. But What this ( record = EMPTY_OBJECT ) does? are we assigning default value(Empty Object) if no arguments found ?
const EMPTY_OBJECT = {};
this.getSelectedUser = Reselect.createSelector(
this.getUserRecords,
(record = EMPTY_OBJECT) => record.selectedUser || EMPTY_OBJECT
);
javascript ecmascript-6 reselect
asked Nov 21 '18 at 14:05
MunnaMunna
70411128
1
default function parameter: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Davin Tryon
Nov 21 '18 at 14:08
add a comment |
i am new to redux and es6. I m little confused with below fat arrow function. I know fat arrow function. But What this ( record = EMPTY_OBJECT ) does? are we assigning default value(Empty Object) if no arguments found ?
const EMPTY_OBJECT = {};
this.getSelectedUser = Reselect.createSelector(
this.getUserRecords,
(record = EMPTY_OBJECT) => record.selectedUser || EMPTY_OBJECT
);
javascript ecmascript-6 reselect
asked Nov 21 '18 at 14:05
MunnaMunna
70411128
i am new to redux and es6. I m little confused with below fat arrow function. I know fat arrow function. But What this ( record = EMPTY_OBJECT ) does? are we assigning default value(Empty Object) if no arguments found ?
const EMPTY_OBJECT = {};
this.getSelectedUser = Reselect.createSelector(
this.getUserRecords,
(record = EMPTY_OBJECT) => record.selectedUser || EMPTY_OBJECT
);
javascript ecmascript-6 reselect
javascript ecmascript-6 reselect
asked Nov 21 '18 at 14:05
MunnaMunna
70411128
asked Nov 21 '18 at 14:05
MunnaMunna
70411128
asked Nov 21 '18 at 14:05
MunnaMunna
70411128
asked Nov 21 '18 at 14:05
MunnaMunna
70411128
asked Nov 21 '18 at 14:05
MunnaMunna
70411128
70411128
1
default function parameter: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Davin Tryon
Nov 21 '18 at 14:08
add a comment |
1
default function parameter: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Davin Tryon
Nov 21 '18 at 14:08
1
1
default function parameter: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Davin Tryon
Nov 21 '18 at 14:08
default function parameter: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Davin Tryon
Nov 21 '18 at 14:08
add a comment |
1 Answer
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Yes, this is exaclty what is happenning, by EMPTY_OBJECT they literally mean empty object for a default value, otherwise if you do not provide a default one, an error will occur on the component that depends on this value. The default value can be anything, not just an object, but most of the times is either object or array.
answered Nov 21 '18 at 14:08
squeekyDavesqueekyDave
489217
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Yes, this is exaclty what is happenning, by EMPTY_OBJECT they literally mean empty object for a default value, otherwise if you do not provide a default one, an error will occur on the component that depends on this value. The default value can be anything, not just an object, but most of the times is either object or array.
answered Nov 21 '18 at 14:08
squeekyDavesqueekyDave
489217
add a comment |
Yes, this is exaclty what is happenning, by EMPTY_OBJECT they literally mean empty object for a default value, otherwise if you do not provide a default one, an error will occur on the component that depends on this value. The default value can be anything, not just an object, but most of the times is either object or array.
answered Nov 21 '18 at 14:08
squeekyDavesqueekyDave
489217
add a comment |
Yes, this is exaclty what is happenning, by EMPTY_OBJECT they literally mean empty object for a default value, otherwise if you do not provide a default one, an error will occur on the component that depends on this value. The default value can be anything, not just an object, but most of the times is either object or array.
answered Nov 21 '18 at 14:08
squeekyDavesqueekyDave
489217
Yes, this is exaclty what is happenning, by EMPTY_OBJECT they literally mean empty object for a default value, otherwise if you do not provide a default one, an error will occur on the component that depends on this value. The default value can be anything, not just an object, but most of the times is either object or array.
answered Nov 21 '18 at 14:08
squeekyDavesqueekyDave
489217
answered Nov 21 '18 at 14:08
squeekyDavesqueekyDave
489217
answered Nov 21 '18 at 14:08
squeekyDavesqueekyDave
489217
answered Nov 21 '18 at 14:08
squeekyDavesqueekyDave
489217
489217
add a comment |
add a comment |
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1
default function parameter: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Davin Tryon
Nov 21 '18 at 14:08