JavaScript What do we call this type of argument passing mul(1)(2)(3) how to solve this and how to solve such scenario in case of n arguments passed like this [duplicate] what call this symbol,what call this sign,what this

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Answer:1

It is called currying.

The main part is to return the same function again and again.

Then you need a mechanism to get the result. In Javascript, the toString method is called if the calling function requires a primitive value.

function mul(x) {
    function f(y) {            // the function to return
        x *= y;                // update the value
        return f;              // return the function
    };

    f.toString = function () { // overwrite toString prototype
       return x;               // return value
    };

    return f;                  // return function, enable currying
}

console.log(mul(1)(2)(3));
console.log(mul(1)(2)(3)(4)(5)(6));
Answer:2

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