how to use the isset function from lodash in javascript

In JavaScript, there is no built-in function called isset. However, you can use the lodash library to achieve similar functionality using the _.isUndefined and _.isNull methods.

To check if a variable is set or not in JavaScript using lodash, you can do the following:

index.tsx
const _ = require('lodash');

const variable = 'hello world';
if (_.isUndefined(variable) || _.isNull(variable)) {
  console.log('Variable is not set');
} else {
  console.log('Variable is set');
}
198 chars
9 lines

In this example, we first import the lodash library using require. We then declare a variable and use the _.isUndefined and _.isNull methods to check if the variable is not defined or is null. We then print a message depending on whether the variable is set or not.

Note that this approach works only for checking if a variable is not defined or is null. If you want to check for other falsy values like false, 0, or an empty string, you can use the Truthy function in lodash.