First-Class Function
A programming language is said to have First-class functions if functions in that language are treated like other variables. So the functions can be assigned to any other variable or passed as an argument or can be returned by another function.
JavaScript treats function as a first-class citizen. This means that functions are simply a value and are just another type of object.
Example: Let us take an example to understand more about the first-class function.
const Arithmetics = {
add:(a, b) => {
return `${a} + ${b} = ${a+b}`;
},
subtract:(a, b) => {
return `${a} - ${b} = ${a-b}`
},
multiply:(a, b) => {
return `${a} * ${b} = ${a*b}`
},
division:(a, b) => {
if(b!=0) return `${a} / ${b} = ${a/b}`;
return `Cannot Divide by Zero!!!`;
}
}
console.log(Arithmetics.add(100, 100));
console.log(Arithmetics.subtract(100, 7));
console.log(Arithmetics.multiply(5, 5));
console.log(Arithmetics.division(100, 5));
Output: In the above program, functions are stored as a variable in an object.
"100 + 100 = 200"
"100 - 7 = 93"
"5 * 5 = 25"
"100 / 5 = 20"
Difference between First-Class and Higher-Order Functions in JavaScript
Understanding the difference between first-class and higher-order functions in JavaScript is really important. These are big concepts in programming, especially in the kind of coding used for making websites. This article is all about explaining what they are, how they are used, and why they are so important.
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