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JavaScript: Negates a predicate function

JavaScript fundamental (ES6 Syntax): Exercise-89 with Solution

Write a JavaScript program to negates a predicate function.


Note: Take a predicate function and apply the not operator (!) to it with its arguments.

  • Take a predicate function and apply the not operator (!) to it with its arguments.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const negate = func => (...args) => !func(...args);
console.log([1, 2, 3, 4, 5, 6].filter(negate(n => n % 2 === 0)));

Sample Output:

[1,3,5]

Flowchart:

flowchart: Negates a predicate function

Live Demo:

See the Pen javascript-basic-exercise-89-1 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

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JavaScript: Tips of the Day

Chunks an array into n smaller arrays

Example:

const tips_chunkIntoN = (arr, n) => {
  const size = Math.ceil(arr.length / n);
  return Array.from({ length: n }, (v, i) =>
    arr.slice(i * size, i * size + size)
  );
}
console.log(tips_chunkIntoN([1, 2, 3, 4, 5, 6, 7,8], 4)); 

Output:

[[1,2],[3,4],[5,6],[7,8]]