add an object to an array if it doesn't have the same key with one of the objects in the array
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0
down vote
favorite
I'm using Lodash. I have the array below:
const array = [{id:1,name:a},{id:2,name:b},{id:3,name:c},{id:4,name:d},{id:5,name:e}];
and I'm about to add another object to this array but before that, I need to check if the new object's name is already in the array or not and if there is one with the name I won't add the new object anymore.
I know some ways to do it, for instance, a loop with _.map
, but want to make sure if there is an easier way.
javascript lodash
add a comment |
up vote
0
down vote
favorite
I'm using Lodash. I have the array below:
const array = [{id:1,name:a},{id:2,name:b},{id:3,name:c},{id:4,name:d},{id:5,name:e}];
and I'm about to add another object to this array but before that, I need to check if the new object's name is already in the array or not and if there is one with the name I won't add the new object anymore.
I know some ways to do it, for instance, a loop with _.map
, but want to make sure if there is an easier way.
javascript lodash
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I'm using Lodash. I have the array below:
const array = [{id:1,name:a},{id:2,name:b},{id:3,name:c},{id:4,name:d},{id:5,name:e}];
and I'm about to add another object to this array but before that, I need to check if the new object's name is already in the array or not and if there is one with the name I won't add the new object anymore.
I know some ways to do it, for instance, a loop with _.map
, but want to make sure if there is an easier way.
javascript lodash
I'm using Lodash. I have the array below:
const array = [{id:1,name:a},{id:2,name:b},{id:3,name:c},{id:4,name:d},{id:5,name:e}];
and I'm about to add another object to this array but before that, I need to check if the new object's name is already in the array or not and if there is one with the name I won't add the new object anymore.
I know some ways to do it, for instance, a loop with _.map
, but want to make sure if there is an easier way.
javascript lodash
javascript lodash
asked Nov 22 at 16:27
farm command
6518
6518
add a comment |
add a comment |
4 Answers
4
active
oldest
votes
up vote
2
down vote
accepted
You could use Lodash's some which if provided with an appropriate predicate e.g. (item => item.name === newName)
will return a boolean indicating whether or not the item already exists (in this case, true would mean the name already exists). The benefit of using this over other iterating methods is that it will stop as soon as it finds one that returns true resulting in better performance.
add a comment |
up vote
0
down vote
With native javascript , you can use findIndex
, this will return the index of the object where the name matches. If it returns -1
then there is no such object with same name. In that case update the array.
const array = [{
id: 1,
name: 'a'
}, {
id: 2,
name: 'b'
}, {
id: 3,
name: 'c'
}, {
id: 4,
name: 'd'
}, {
id: 5,
name: 'e'
}];
let newObjToAdd = {
id: 1,
name: 'z'
};
let newObjNotToAdd = {
id: 1,
name: 'a'
}
function updateArray(obj) {
let k = array.findIndex((item) => {
return item.name === obj.name;
})
if (k === -1) {
array.push(obj)
} else {
console.log('Array contains object with this name')
}
}
updateArray(newObjToAdd);
console.log(array)
updateArray(newObjNotToAdd);
thanks, that is nice but i needed to do it via Lodash, but thanks anyway
– farm command
Nov 22 at 16:49
1
if you can use loadash you can use js also
– brk
Nov 22 at 16:50
i know that, but lodash makes it shorter and easier to document
– farm command
Nov 22 at 17:04
add a comment |
up vote
0
down vote
You don't need lodash for some
. You get that with native JS too (ES6):
const array = [{id:1,name:'a'},{id:2,name:'b'},{id:3,name:'c'},{id:4,name:'d'},{id:5,name:'e'}];
console.log(array.some(e => e.name === 'a'));
if (!array.some(e => e.name === 'z')) {
array.push({id: 5, name: 'z'});
}
console.log(array);
add a comment |
up vote
0
down vote
Doing this with lodash is few chars shorter but here is how you could do it with ES6 and Array.some
:
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!array.some(x => x.id == obj.id))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
Same idea with lodash and _.some would be:
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!_.some(array, {id: obj.id}))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>
Note that you could also use various other ways to get the same result. Array.find or _.find would work as well since all you have to do is to check if there was a hit:
const maybeUpdate = (arr, obj) => {
if(!_.find(array, {id: obj.id})) // or if(!array.find(x => x.id == obj.id))
array.push(obj)
}
add a comment |
4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
accepted
You could use Lodash's some which if provided with an appropriate predicate e.g. (item => item.name === newName)
will return a boolean indicating whether or not the item already exists (in this case, true would mean the name already exists). The benefit of using this over other iterating methods is that it will stop as soon as it finds one that returns true resulting in better performance.
add a comment |
up vote
2
down vote
accepted
You could use Lodash's some which if provided with an appropriate predicate e.g. (item => item.name === newName)
will return a boolean indicating whether or not the item already exists (in this case, true would mean the name already exists). The benefit of using this over other iterating methods is that it will stop as soon as it finds one that returns true resulting in better performance.
add a comment |
up vote
2
down vote
accepted
up vote
2
down vote
accepted
You could use Lodash's some which if provided with an appropriate predicate e.g. (item => item.name === newName)
will return a boolean indicating whether or not the item already exists (in this case, true would mean the name already exists). The benefit of using this over other iterating methods is that it will stop as soon as it finds one that returns true resulting in better performance.
You could use Lodash's some which if provided with an appropriate predicate e.g. (item => item.name === newName)
will return a boolean indicating whether or not the item already exists (in this case, true would mean the name already exists). The benefit of using this over other iterating methods is that it will stop as soon as it finds one that returns true resulting in better performance.
answered Nov 22 at 16:32
jordrake
28914
28914
add a comment |
add a comment |
up vote
0
down vote
With native javascript , you can use findIndex
, this will return the index of the object where the name matches. If it returns -1
then there is no such object with same name. In that case update the array.
const array = [{
id: 1,
name: 'a'
}, {
id: 2,
name: 'b'
}, {
id: 3,
name: 'c'
}, {
id: 4,
name: 'd'
}, {
id: 5,
name: 'e'
}];
let newObjToAdd = {
id: 1,
name: 'z'
};
let newObjNotToAdd = {
id: 1,
name: 'a'
}
function updateArray(obj) {
let k = array.findIndex((item) => {
return item.name === obj.name;
})
if (k === -1) {
array.push(obj)
} else {
console.log('Array contains object with this name')
}
}
updateArray(newObjToAdd);
console.log(array)
updateArray(newObjNotToAdd);
thanks, that is nice but i needed to do it via Lodash, but thanks anyway
– farm command
Nov 22 at 16:49
1
if you can use loadash you can use js also
– brk
Nov 22 at 16:50
i know that, but lodash makes it shorter and easier to document
– farm command
Nov 22 at 17:04
add a comment |
up vote
0
down vote
With native javascript , you can use findIndex
, this will return the index of the object where the name matches. If it returns -1
then there is no such object with same name. In that case update the array.
const array = [{
id: 1,
name: 'a'
}, {
id: 2,
name: 'b'
}, {
id: 3,
name: 'c'
}, {
id: 4,
name: 'd'
}, {
id: 5,
name: 'e'
}];
let newObjToAdd = {
id: 1,
name: 'z'
};
let newObjNotToAdd = {
id: 1,
name: 'a'
}
function updateArray(obj) {
let k = array.findIndex((item) => {
return item.name === obj.name;
})
if (k === -1) {
array.push(obj)
} else {
console.log('Array contains object with this name')
}
}
updateArray(newObjToAdd);
console.log(array)
updateArray(newObjNotToAdd);
thanks, that is nice but i needed to do it via Lodash, but thanks anyway
– farm command
Nov 22 at 16:49
1
if you can use loadash you can use js also
– brk
Nov 22 at 16:50
i know that, but lodash makes it shorter and easier to document
– farm command
Nov 22 at 17:04
add a comment |
up vote
0
down vote
up vote
0
down vote
With native javascript , you can use findIndex
, this will return the index of the object where the name matches. If it returns -1
then there is no such object with same name. In that case update the array.
const array = [{
id: 1,
name: 'a'
}, {
id: 2,
name: 'b'
}, {
id: 3,
name: 'c'
}, {
id: 4,
name: 'd'
}, {
id: 5,
name: 'e'
}];
let newObjToAdd = {
id: 1,
name: 'z'
};
let newObjNotToAdd = {
id: 1,
name: 'a'
}
function updateArray(obj) {
let k = array.findIndex((item) => {
return item.name === obj.name;
})
if (k === -1) {
array.push(obj)
} else {
console.log('Array contains object with this name')
}
}
updateArray(newObjToAdd);
console.log(array)
updateArray(newObjNotToAdd);
With native javascript , you can use findIndex
, this will return the index of the object where the name matches. If it returns -1
then there is no such object with same name. In that case update the array.
const array = [{
id: 1,
name: 'a'
}, {
id: 2,
name: 'b'
}, {
id: 3,
name: 'c'
}, {
id: 4,
name: 'd'
}, {
id: 5,
name: 'e'
}];
let newObjToAdd = {
id: 1,
name: 'z'
};
let newObjNotToAdd = {
id: 1,
name: 'a'
}
function updateArray(obj) {
let k = array.findIndex((item) => {
return item.name === obj.name;
})
if (k === -1) {
array.push(obj)
} else {
console.log('Array contains object with this name')
}
}
updateArray(newObjToAdd);
console.log(array)
updateArray(newObjNotToAdd);
const array = [{
id: 1,
name: 'a'
}, {
id: 2,
name: 'b'
}, {
id: 3,
name: 'c'
}, {
id: 4,
name: 'd'
}, {
id: 5,
name: 'e'
}];
let newObjToAdd = {
id: 1,
name: 'z'
};
let newObjNotToAdd = {
id: 1,
name: 'a'
}
function updateArray(obj) {
let k = array.findIndex((item) => {
return item.name === obj.name;
})
if (k === -1) {
array.push(obj)
} else {
console.log('Array contains object with this name')
}
}
updateArray(newObjToAdd);
console.log(array)
updateArray(newObjNotToAdd);
const array = [{
id: 1,
name: 'a'
}, {
id: 2,
name: 'b'
}, {
id: 3,
name: 'c'
}, {
id: 4,
name: 'd'
}, {
id: 5,
name: 'e'
}];
let newObjToAdd = {
id: 1,
name: 'z'
};
let newObjNotToAdd = {
id: 1,
name: 'a'
}
function updateArray(obj) {
let k = array.findIndex((item) => {
return item.name === obj.name;
})
if (k === -1) {
array.push(obj)
} else {
console.log('Array contains object with this name')
}
}
updateArray(newObjToAdd);
console.log(array)
updateArray(newObjNotToAdd);
answered Nov 22 at 16:33
brk
25.2k31939
25.2k31939
thanks, that is nice but i needed to do it via Lodash, but thanks anyway
– farm command
Nov 22 at 16:49
1
if you can use loadash you can use js also
– brk
Nov 22 at 16:50
i know that, but lodash makes it shorter and easier to document
– farm command
Nov 22 at 17:04
add a comment |
thanks, that is nice but i needed to do it via Lodash, but thanks anyway
– farm command
Nov 22 at 16:49
1
if you can use loadash you can use js also
– brk
Nov 22 at 16:50
i know that, but lodash makes it shorter and easier to document
– farm command
Nov 22 at 17:04
thanks, that is nice but i needed to do it via Lodash, but thanks anyway
– farm command
Nov 22 at 16:49
thanks, that is nice but i needed to do it via Lodash, but thanks anyway
– farm command
Nov 22 at 16:49
1
1
if you can use loadash you can use js also
– brk
Nov 22 at 16:50
if you can use loadash you can use js also
– brk
Nov 22 at 16:50
i know that, but lodash makes it shorter and easier to document
– farm command
Nov 22 at 17:04
i know that, but lodash makes it shorter and easier to document
– farm command
Nov 22 at 17:04
add a comment |
up vote
0
down vote
You don't need lodash for some
. You get that with native JS too (ES6):
const array = [{id:1,name:'a'},{id:2,name:'b'},{id:3,name:'c'},{id:4,name:'d'},{id:5,name:'e'}];
console.log(array.some(e => e.name === 'a'));
if (!array.some(e => e.name === 'z')) {
array.push({id: 5, name: 'z'});
}
console.log(array);
add a comment |
up vote
0
down vote
You don't need lodash for some
. You get that with native JS too (ES6):
const array = [{id:1,name:'a'},{id:2,name:'b'},{id:3,name:'c'},{id:4,name:'d'},{id:5,name:'e'}];
console.log(array.some(e => e.name === 'a'));
if (!array.some(e => e.name === 'z')) {
array.push({id: 5, name: 'z'});
}
console.log(array);
add a comment |
up vote
0
down vote
up vote
0
down vote
You don't need lodash for some
. You get that with native JS too (ES6):
const array = [{id:1,name:'a'},{id:2,name:'b'},{id:3,name:'c'},{id:4,name:'d'},{id:5,name:'e'}];
console.log(array.some(e => e.name === 'a'));
if (!array.some(e => e.name === 'z')) {
array.push({id: 5, name: 'z'});
}
console.log(array);
You don't need lodash for some
. You get that with native JS too (ES6):
const array = [{id:1,name:'a'},{id:2,name:'b'},{id:3,name:'c'},{id:4,name:'d'},{id:5,name:'e'}];
console.log(array.some(e => e.name === 'a'));
if (!array.some(e => e.name === 'z')) {
array.push({id: 5, name: 'z'});
}
console.log(array);
const array = [{id:1,name:'a'},{id:2,name:'b'},{id:3,name:'c'},{id:4,name:'d'},{id:5,name:'e'}];
console.log(array.some(e => e.name === 'a'));
if (!array.some(e => e.name === 'z')) {
array.push({id: 5, name: 'z'});
}
console.log(array);
const array = [{id:1,name:'a'},{id:2,name:'b'},{id:3,name:'c'},{id:4,name:'d'},{id:5,name:'e'}];
console.log(array.some(e => e.name === 'a'));
if (!array.some(e => e.name === 'z')) {
array.push({id: 5, name: 'z'});
}
console.log(array);
answered Nov 22 at 17:04
slider
7,8651129
7,8651129
add a comment |
add a comment |
up vote
0
down vote
Doing this with lodash is few chars shorter but here is how you could do it with ES6 and Array.some
:
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!array.some(x => x.id == obj.id))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
Same idea with lodash and _.some would be:
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!_.some(array, {id: obj.id}))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>
Note that you could also use various other ways to get the same result. Array.find or _.find would work as well since all you have to do is to check if there was a hit:
const maybeUpdate = (arr, obj) => {
if(!_.find(array, {id: obj.id})) // or if(!array.find(x => x.id == obj.id))
array.push(obj)
}
add a comment |
up vote
0
down vote
Doing this with lodash is few chars shorter but here is how you could do it with ES6 and Array.some
:
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!array.some(x => x.id == obj.id))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
Same idea with lodash and _.some would be:
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!_.some(array, {id: obj.id}))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>
Note that you could also use various other ways to get the same result. Array.find or _.find would work as well since all you have to do is to check if there was a hit:
const maybeUpdate = (arr, obj) => {
if(!_.find(array, {id: obj.id})) // or if(!array.find(x => x.id == obj.id))
array.push(obj)
}
add a comment |
up vote
0
down vote
up vote
0
down vote
Doing this with lodash is few chars shorter but here is how you could do it with ES6 and Array.some
:
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!array.some(x => x.id == obj.id))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
Same idea with lodash and _.some would be:
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!_.some(array, {id: obj.id}))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>
Note that you could also use various other ways to get the same result. Array.find or _.find would work as well since all you have to do is to check if there was a hit:
const maybeUpdate = (arr, obj) => {
if(!_.find(array, {id: obj.id})) // or if(!array.find(x => x.id == obj.id))
array.push(obj)
}
Doing this with lodash is few chars shorter but here is how you could do it with ES6 and Array.some
:
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!array.some(x => x.id == obj.id))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
Same idea with lodash and _.some would be:
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!_.some(array, {id: obj.id}))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>
Note that you could also use various other ways to get the same result. Array.find or _.find would work as well since all you have to do is to check if there was a hit:
const maybeUpdate = (arr, obj) => {
if(!_.find(array, {id: obj.id})) // or if(!array.find(x => x.id == obj.id))
array.push(obj)
}
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!array.some(x => x.id == obj.id))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!array.some(x => x.id == obj.id))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!_.some(array, {id: obj.id}))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>
const array = [{ id: 1, name: "A" }, { id: 2, name: "B" }, { id: 3, name: "C" }, { id: 4, name: "D" }, { id: 5, name: "C" }];
const maybeUpdate = (arr, obj) => {
if(!_.some(array, {id: obj.id}))
array.push(obj)
}
maybeUpdate(array, {id: 2, name: "F"}) // id exists wont insert
maybeUpdate(array, {id: 12, name: "F"}) // will insert
console.log(array)
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>
edited Nov 22 at 17:11
answered Nov 22 at 17:05
Akrion
9,11911223
9,11911223
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