Imagine we have a scenario like the one below:
class Individual {
lastName: string;
firstName: string;
getCompleteName(separator: string) {
return this.lastName + separator + this.firstName;
}
}
const person = ...
const completeName = _.ifNotNull(person, value => value.getCompleteName('-'));
Does Lodash offer an alternative to the ifNotNull function which executes a method on the object parameter only if it is not null or undefined?
Indeed, Lodash offers the specific function you are seeking, it's known as _.invoke. In the scenario mentioned earlier, you can implement it like this:
const fullName = _.invoke(person, "getFullName", "-");
And it will perform as expected. So, how does _.invoke function?
_.invoke is: _.invoke(object, path, [args]). It triggers the method at the specified path (which could be a nested path or just the method name) within the object, with binding to the object for this.Certainly! I have set up a Codepen where you can directly test this and other methods to achieve the same outcome straight from your browser. Just ensure to access the browser console to view the test outcomes! Here is the link, look for _.invoke in testcase1a() and testcase1b():
https://codepen.io/jhack_jos/pen/ExNVbWp
person is undefined or doesn't contain a method named getFullName, then the expression _.invoke(person, "getFullName", "-"); //STEP 1
const fullName = _.invoke(person, "getFullName", "-");
//STEP 2
const fullName = undefined;
person is defined and has the method getFullName: //STEP 1
const fullName = _.invoke(person, "getFullName", "-");
//STEP 2
const fullName = person.getFullName("-");
//STEP 3
const fullName = "surname-firstname";
If person possesses a property that is not a method named getFullName, you'll encounter a runtime error!!
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