I am working with a two-dimensional JSON array and I am able to retrieve data from the first dimension using data["dimension-1"], but I am struggling to access data from the second dimension using data["dimension-1"]["dimension-2"]. What is the correct method to extract a single row from the second dimension of my array?
When looking at data["dimension-1"]["dimension-2"], it appears to be an object, so it should follow this structure:
var data = {
"dimension-1" : {
"dimension-2" : 'value'
}
}
data["dimension-1"]["dimension-2"] // will show 'value'
Your current approach is correct.
However, if it's actually an array:
var data =[[1,2], [3,4]]
You would access it with numeric indexes like this:
data[0][1] // will display 2
If you have an object that contains properties which are a mix of arrays or objects, and you want to retrieve the ID from a data property that is an array, you will need to access the property, then access the array (remembering that the first item is index 0), which will return another object. From there, you can simply select the desired property.
To achieve this in your scenario, you can use the following notation:
objectName.data[0].id
or
objectName["data"][0]["id"];
This code snippet demonstrates how to extract the ID from the `data` attribute within an object structure similar to the one provided:
var objectName = {
"total_pages": 1424,
"total_rows": 1424,
"data": [
{
"id": 1525,
"television_id": 1,
// other details
"categories": [
{
"id": 170,
"title": "title"
},
{
"id": 4,
"title": "message"
}
]
}
]
}
Here is an example of a 2-dimensional JSON array:
[
["apple", "banana", "cherry"],
["date", "elderberry", "fig"],
["grape", "honeydew", "kiwi"]
]
If you need to access a specific element, like "elderberry" in this case, you will have to refer to it by its index rather than name. For instance:
data[1][1]
NOTE:
Although my initial answer remains valid – utilizing indices to access elements within your 2D array – I now understand the structure of your data and offer alternative suggestions:
You can opt for using a library (such as lodash) that provides convenient methods to query your data
Another option is to create a custom function, for example:
var fruit = getFruit(x.data, 1525, 170);
function getFruit(data, id, fruitId) {
return data
.filter(d => d.id === id)
.map(d => d.fruits
.filter(f => f.id === fruitId)
.map(f => f.name)
.shift()
)
.shift()
}
Best of luck!
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