First Class Function:

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Apr 17, 2024

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#3 Javascript Series

In JavaScript, functions are treated as first-class citizens, which means that functions can be used like any other value, such as being passed as an argument, assigned to a variable, or returned as a result of a function.

A function assignment to a variable

function add (a,b){
    return a+b;
}
const sum = add;
console.log(sum(2,3));

Output: 5

A function passed as an argument to another function

function greet (name, fn){
     fn (name);
}
greet ("Deep", (nm)=>{
     console.log(`Hello, ${nm}`);
});

Output: Hello Deep

A function returning function as a result

function HOF(){
    return function(){
         console.log("Hello");
    }
}
const LOF = HOF();
LOF();

Output: Hello