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method-overloading.js
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76 lines (67 loc) · 2.15 KB
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/**
* An example of method overloading with JavaScript, also known as 'monkey patching'.
* JavaScript as a language does not inherently support method overloading, but we can
* implement our own solution as we have access to the array of arguments supplied to the function.
* This gives us substantially more control over the method overloading interface.
*/
class Adder {
/**
* Entry function to handle addition with different arguments
*
* @params {int} a First integer
* @params {int} b Second integer
* Or;
* @params {int} a First integer
* @params {int} b Second integer
* @params {int} c Third integer
* Or;
* @params {Array} a Array of integers
*
* @returns {int} Sum of arguments
* @throws {error} If arguments do not match one of the above params
*/
add(a, b) {
const argArray = Array.prototype.slice.call(arguments);
// If the length is 2, we have `a` and `b` as arguments
if (argArray.length === 2) {
return a + b;
}
// If the length is 3, we have `a`, `b`, and `c` as arguments
if (argArray.length === 3) {
return this.addThreeArgs.apply(this, arguments);
}
// If `a` is an Array, we can sum using `addArray`
if (Array.isArray(a)) {
return this.addArray.apply(this, arguments);
}
// If none of the above match, we were given invalid input
throw new Error('Please use one of the following formats: add(1, 2), add(1, 2, 3) or add([1, 2, 3]).');
}
/**
* Sum three numbers
*
* @params {int} a First integer
* @params {int} b Second integer
* @params {int} c Third integer
* @returns {int} Sum of a, b, and c
*/
addThreeArgs(a, b, c) {
return a + b + c;
}
/**
* Reduce array values to a single sum value of array items
*
* @params {Array} a Array of integers
* @returns {int} Sum of items in array
*/
addArray(arr) {
return arr.reduce((acc, cur) => acc + cur);
}
}
const adder = new Adder();
const addWithTwo = adder.add(1, 1); // 2
console.log(addWithTwo);
const addWithThree = adder.add(1, 2, 3); // 6
console.log(addWithThree);
const addWithArray = adder.add([1, 2, 3, 4]); // 10
console.log(addWithArray);