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How to convert value into key & another key into value in JavaScript [duplicate]

This question already has answers here:
How to convert array of key–value objects to array of objects with a single property?
(5 answers)
Closed 1 year ago.
This is my array of Object. I want to convert my first value into key & Second value into value only. Please go through question and i have also attached my desired output.
[
{
"name": "Unknown",
"value": "RAHUL"
},
{
"name": "FirstName",
"value": "WILLEKE LISELOTTE"
},
{
"name": "LastName",
"value": "DE BRUIJN"
}
]
I want my Object as
{
"Unknown": "RAHUL"
},
{
"FirstName": "WILLEKE LISELOTTE"
},
{
"LastName": "DE BRUIJN"
}

IF you mean to create a new array, then simply map the original array. You don't need to create a new array and push into it, that's just redundant code:
const testData = [{
"name": "Unknown",
"value": "RAHUL"
},
{
"name": "FirstName",
"value": "WILLEKE LISELOTTE"
},
{
"name": "LastName",
"value": "DE BRUIJN"
}
];
const newData = testData.map(nameObject => {
return {
[nameObject.name]: nameObject.value
}
});
console.log(newData);

You just have to use brackets for [value.name] to perform achieve this.
var arr = []
testdata.map((value) => {
arr.push({ [value.name]: value.value })
})

filter array by its name inside an object [duplicate]

This question already has an answer here:
JS Calling Object Property by Variable
(1 answer)
Closed 2 years ago.
var dictionary = {
"english" : [{"key" : "1", "value" : "abc"}],
"french" : [[{"key" : "1", "value" : "xyz"}]]
}
if I do this filter it is working :
dictionary.english.filter ( obj => {return obj.value === "abc"})
but if mention the array name english in a variable and use the same filter it shows me undefined:
var language = 'english';
dictionary.language .filter ( obj => {return obj.value === "abc"})
what is the difference and how to fix it?

Try this
var dictionary = {
"english": [{
"key": "1",
"value": "abc"
}],
"french": [
[{
"key": "1",
"value": "xyz"
}]
]
}
var language = 'english';
let _d = dictionary[language].filter(obj => {
return obj.value === "abc"
})
console.log(_d)

Filter array based property value [duplicate]

This question already has answers here:
Get JavaScript object from array of objects by value of property [duplicate]
(17 answers)
Closed 3 years ago.
I have a JSON file containing 13k objects. I need to get only the objects which have the events { name: "Submitted"} property from it. events is an array of objects which contain multiple name properties. Here is a screenshot of how it looks:
{
"_id": "03c319a5-86d4-4ce6-ba19-1a50584cecb4",
"_rev": "21-7cb67ebb46c485ff443995fc27bdd950",
"doctype": "application",
"events": [{
"name": "change",
"time": 1532547503182
},
{
"name": "change",
"time": 1532547503182
},
{
"name": "submitted",
"time": 1532547503182
},
{
"name": "edited",
"time": 1532547503182
}
]
}
This is how I get all the object inside the json file:
$.getJSON("export.json", function(data) {
var data = [];
var arrays = data;
var i;
for (i = 0; i < arrays.length; i++) {
console.log(arrays[i]);
}
});
Now I need to push all the objects which have events[name:submitted] I get in arrays[i] into the doc[]. How can I filter the results?

You can filter your array of the object by filter method.
$.getJSON("export.json", function(data) {
var data = [];
var arrays = data;
var newArray = arrays.filter(function (el) {
return el.name == 'Submitted';
});
console.log(newArray);
});
You can also do in one line using ES6 arrow function
var newArray = arrays.filter(el => el.name === 'Submitted')

You can use filter(), checking each element in the events array to see if the name is equal to submitted:
const object = {
"_id": "03c319a5-86d4-4ce6-ba19-1a50584cecb4",
"_rev": "21-7cb67ebb46c485ff443995fc27bdd950",
"doctype": "application",
"events": [{
"name": "change",
"time": 1532547503182
},
{
"name": "change",
"time": 1532547503182
},
{
"name": "submitted",
"time": 1532547503182
},
{
"name": "edited",
"time": 1532547503182
}
]
}
const filtered = object.events.filter(obj => obj.name === 'submitted')
console.log(filtered)

Convert an array of object to the array of string in TypeScript [duplicate]

This question already has answers here:
Accessing properties of an array of objects [duplicate]
(5 answers)
Closed 5 years ago.
Using lodash I need to convert an array of object to the array of string.
Original array,
const tags = [{
"display": "tag1",
"value": "tag1"
}, {
"display": "tag2",
"value": "tag2"
}]
Expected result,
const tags = ["tag1", "tag2"]
I tried this way,
const data = [{
"display": "tag1",
"value": "tag1"
}, {
"display": "tag2",
"value": "tag2"
}]
const result = _(data)
.flatMap(_.values)
.map((item) => { if (typeof item === 'string') { return item; } else { return; } })
.value()
console.log('result', result);

You dont need lodash, you can do with plain JS using map
DEMO
const tags = [{
"display": "tag1",
"value": "tag1"
}, {
"display": "tag2",
"value": "tag2"
}]
var result = tags.map(a => a.display);
console.log(result);

Filter an array of object by object content [duplicate]

This question already has answers here:
How to filter object array based on attributes?
(21 answers)
Closed 6 years ago.
I am trying to filter an array of objects by its content, i.e.:
https://jsfiddle.net/z7g3unyu/2/
var arr =[
{
"uid": "1",
"name": "John Doe"
},
{
"uid": "2",
"name": "Kate Roe"
}
];
var newArr = arr.filter(function(e) {
return e["uid"] == 1;
});
alert(newArr["name"]);
I wanted to create a new array that contains only one object which uid is equal to 1. However, it gives me undefined. What am I doing wrong?

Here you assign the value:
return e["uid"] = 1;
Use double equals == to check the value for equality:
return e["uid"] == 1;
Note that filter() returns array, not object. Use brackets notation [0] to get first element from an array.
See working snippet below
var arr = [{
"uid": "1",
"name": "John Doe"
}, {
"uid": "2",
"name": "Kate Roe"
}];
var newArr = arr.filter(function(e) {
return e["uid"] == 1;
});
alert(newArr[0]["name"]);

Using Lodash
_.filter(array, { uid: 1 });