To get the subset of properties of a JavaScript Object, we make use of destructuring and Property Shorthand. The destructuring assignment syntax is a JavaScript expression that makes it possible to unpack values from arrays, or properties from objects, into distinct variables.
Syntax:
subset = (({a, c}) => ({a, c}))(obj);
Example1: Get subset of a javascript object’s properties using destructuring assignment.
html
<!DOCTYPE html>
<html>
<head>
<title>
Get a subset of a javascript object’s properties
</title>
</head>
<body>
<center>
<h1 style="color:green">
GeeksforGeeks
</h1>
<h2>
Get a subset of a javascript object’s properties
</h2>
<script>
obj = {
property1: 5,
property2: 6,
property3: 7
};
subset = (({
property1, property3
}) => ({
property1, property3
}))(obj);
var output = 'Subset Object: <br>';
for (var property in subset) {
output += property + ': ' + subset[property] + ';<br>';
}
document.write(output);
</script>
</center>
</body>
</html>
|
Output:
In ES6 there is a very concise way to do this using destructing. Destructing allows you to easily add on to objects and make subset objects.
Syntax:
const {c, d, ...partialObject} = object;
const subset = {c, d};
Example 2: Get subset of a javascript object’s properties using destructuring assignment.
html
<!DOCTYPE html>
<html>
<head>
<title>
Get a subset of a javascript object’s properties
</title>
</head>
<body>
<center>
<h1 style="color:green">
GeeksforGeeks
</h1>
<h2>
Get a subset of a javascript object’s properties
</h2>
<script>
const object = {
property1: 'a',
property2: 'b',
property3: 'c',
property4: 'd',
}
const {
property1,
property4,
...pObject
}
= object;
const subset = {
property1,
property4
}
;
var output = 'Subset Object: <br>';
for (var property in subset) {
output += property + ': ' +
subset[property] + ';<br>';
}
document.write(output);
</script>
</center>
</body>
</html>
|
Output:
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