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JavaScript: Create a function that invokes fn with partials appended to the arguments it receives

JavaScript fundamental (ES6 Syntax): Exercise-169 with Solution

Write a JavaScript program to create a function that invokes fn with partials appended to the arguments it receives.

  • Use the spread operator (...) to append partials to the list of arguments of fn.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const partialRight = (fn, ...partials) => (...args) => fn(...args, ...partials);
const greet = (greeting, name) => greeting + ' ' + name + '!';
const greetJohn = partialRight(greet, 'John');
console.log(greetJohn('Hello'));

Sample Output:

Hello John!

Flowchart:

flowchart: Create a function that invokes fn with partials appended to the arguments it receives

Live Demo:

See the Pen javascript-basic-exercise-169-1 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