Looking to create new arrays based on objects with similar attributes from an existing array? Here's how:
Starting with this
[
{name: "test", place: "country"},
{name: "walkAndEat", Long: 100, Lat: 15, Location: "place name"},
{name: "test2", place: "Europe"}
]
You can achieve the following
[
{name: "test", place: "country"},
{name: "test2", place: "Europe"}
]
[
{name: "walkAndEat", Long: 100, Lat: 15, Location: "place name"}
]
If you consider objects to be equal when they have the same properties, one way to handle this is by storing keys as stringified indices in a collection object and then checking if a properties-key already exists:
var arrcoll = {};
function add(o){
var keys = JSON.stringify(Object.keys(o).sort());
var arr = arrcoll[keys];
if(arr)
arr.push(o);
else
arrcoll[keys] = [o];
return arr;
}
This process can be implemented dynamically or on an existing array, as demonstrated in this Fiddle
Imagine you have a collection of objects with various attributes like this:
var entities = [
{ name: 'Seymour Skinner', role: 'Principal' },
{ name: 'Kwik-E-Mart', lat: 23, long: 100 },
{ name: 'Sideshow Bob', role: 'Comic Foil' },
{ name: 'Flaming Tyre Yard', lat: 12, long: 88 },
{ name: 'Joe Quimby', role: 'Mayor' }
];
If you wish to group them into separate lists as shown below:
locations = [
{ name: 'Kwik-E-Mart', lat: 23, long: 100 },
{ name: 'Flaming Tyre Yard', lat: 12, long: 88 }
];
characters = [
{ name: 'Seymour Skinner', role: 'Principal' },
{ name: 'Sideshow Bob', role: 'Comic Foil' },
{ name: 'Joe Quimby', role: 'Mayor' }
];
You can achieve this using the built-in Array.filter method as demonstrated in the code snippet below:
var locations = entities.filter(function(entity) {
if (entity.role !== undefined) {
// it is a character since locations do not have roles
return true;
} else {
return false;
}
});
var characters = entities.filter(function(entity) {
if (entity.lat !== undefined && entity.long !== undefined) {
// it is a location since characters do not have coordinates
return true;
} else {
return false;
}
});
Javascript Objects are versatile entities, allowing for flexibility and adaptability throughout program execution as they exhibit dynamic characteristics.
JavaScript stands out as a loosely typed or dynamic language. This signifies that there is no need to specify the type of a variable in advance. The determination of the variable type occurs automatically during program processing. Consequently, it is possible to have the same variable with different types:
var anything = arrayOfAnyOtherType[0];
This approach remains valid... By iterating through your source array and filling it, each object can be given specific behaviors.
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