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

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

Function with Appended Partials

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:

// Define a function 'partialRight' that partially applies arguments to the right side of a function 'fn'
const partialRight = (fn, ...partials) => (...args) => fn(...args, ...partials);
// Define a function 'greet' that concatenates a 'greeting' string and a 'name' string with an exclamation mark
const greet = (greeting, name) => greeting + ' ' + name + '!';
// Partially apply the 'name' argument as 'John' to the 'greet' function using 'partialRight'
const greetJohn = partialRight(greet, 'John');
// Call the partially applied function 'greetJohn' with the 'greeting' argument as 'Hello'
console.log(greetJohn('Hello'));

Output:

Hello John!

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-169-1 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that creates a function which appends preset arguments to the end of the arguments provided at call time.
• Write a JavaScript function that returns a new function, automatically appending specific values after its runtime arguments.
• Write a JavaScript program that curries a function by fixing the trailing arguments and then applying the remaining ones.
• Write a JavaScript function that demonstrates partial application by appending additional parameters to the original function call.

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