What is currying in TypeScript?
Question
What is currying in TypeScript?
Solution
Currying is a transformation of functions that translates a function from callable as f(a, b, c) into callable as f(a)(b)(c). Currying doesn’t call a function. It just transforms it.
In TypeScript, currying can be implemented like this:
function curry(f: Function): Function {
return function(a: any) {
return function(b: any) {
return f(a, b);
};
};
}
// usage
function sum(a: number, b: number): number {
return a + b;
}
let curriedSum = curry(sum);
console.log( curriedSum(1)(2) ); // 3
In the above example, the curry function does the currying job. When we call curry(sum), it returns a function that keeps the passed argument in its lexical environment. When it gets called again, it takes the second argument and finally applies the original function to both.
This way, we can transform a function call with multiple arguments into a sequence of function calls with a single argument, which can be useful in various scenarios.
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