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JavaScript: Pad a string on both sides with the specified character

JavaScript fundamental (ES6 Syntax): Exercise-38 with Solution

Write a JavaScript program to pad a string on both sides with the specified character, if it's shorter than the specified length.

  • Use String.prototype.padStart() and String.prototype.padEnd() to pad both sides of the given string.
  • Omit the third argument, char, to use the whitespace character as the default padding character.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 

const pad = (str, length, char = ' ') =>
 str.padStart((str.length + length) / 2, char).padEnd(length, char);
console.log(pad('cat', 8));
console.log(pad(String(42), 6, '0'))
console.log(pad('foobar', 3))

Sample Output:

  cat   
004200
foobar

Pictorial Presentation:

JavaScript Fundamental: Pad a string on both sides with the specified character

Flowchart:

flowchart: Pad a string on both sides with the specified character

Live Demo:

See the Pen javascript-basic-exercise-1-38 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

Returns an array of n-tuples of consecutive elements

Example:

const tips_arr = (n, arr) =>  n > arr.length ? [] : arr.slice(n - 1).map((v, i) =>[...arr.slice(i, i + n - 1), v]);
console.log(tips_arr(2, [1, 2, 3, 4, 5])); 
console.log(tips_arr(3, [1, 2, 3, 4, 5]));
console.log(tips_arr(5, [1, 2, 3, 4]));

Output:

[[1, 2], [2, 3], [3, 4], [4, 5]]
[[1, 2, 3], [2, 3, 4], [3, 4, 5]]
[]