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JavaScript: Create a function that accepts up to n arguments, ignoring any additional arguments

JavaScript fundamental (ES6 Syntax): Exercise-258 with Solution

Write a JavaScript program to create a function that accepts up to n arguments, ignoring any additional arguments.

  • Call the provided function, fn, with up to n arguments, using Array.prototype.slice(0, n) and the spread operator (...).

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const ary = (fn, n) => (...args) => fn(...args.slice(0, n));
const firstTwoMax = ary(Math.max, 2);

console.log([[2, 6, 'a'], [8, 4, 6], [10]].map(x => firstTwoMax(...x)));

Sample Output:

[6,8,10]

Flowchart:

flowchart: Create a function that accepts up to n arguments, ignoring any additional arguments.

Live Demo:

See the Pen javascript-basic-exercise-257-1 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring));

includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found: 

var string = "foo";
var substring = "oo";

console.log(string.indexOf(substring) !== -1);

Ref: https://bit.ly/3fFFgZv