Inverting an object is one of the difficult tasks until underscore.js, a javascript framework, came into light. It has many functions in which _.invert() is one of them. This method actually inverts the key/value pairs. For suppose let an object has a key/value like name/Kiran. Then after inverting the object using _.invert() method the key/value pair changes into Kiran/name. Lets' discuss it, in a nutshell, using examples.
syntax
_.invert(object);
This method takes an object as an argument and inverts it. It changes the key/value pair into value/key pair.
Example -1
In the following example 'name', 'salary' and 'age' of a person were inverted into their value/key pairs.
<html>
<body>
<script
src="//cdnjs.cloudflare.com/ajax/libs/lodash.js/0.10.0/lodash.min.js"></script>
</head>
<body>
<script>
var res = JSON.stringify(_.invert({name: 'Raj', age: 38, "salary": 120000}));
document.write((res));
</script>
</body>
</html>Output
{"38":"age","120000":"salary","Raj":"name"}Example-2
In the following example 'name', 'Organization' and 'age' of a person were inverted into their value/key pairs.
<html>
<body>
<script
src="//cdnjs.cloudflare.com/ajax/libs/lodash.js/0.10.0/lodash.min.js"></script>
</head>
<body>
<script type="text/javascript">
var res = JSON.stringify(_.invert({"name": 'ElonMusk',age: 47, "Organization":'Spacex' }));
document.write((res));
</script>
</body>
</html>Output
{"47":"age","ElonMusk":"name","Spacex":"Organization"}