JavaScript: Returns a subset of a string

Last update on May 30 2022 09:58:49 (UTC/GMT +8 hours)

JavaScript Object: Exercise-7 with Solution

Write a JavaScript program which returns a subset of a string.
Sample Data: dog
Expected Output: ["d", "do", "dog", "o", "og", "g"]

Sample Solution: -

HTML Code:

<!DOCTYPE html>
  <html>
  <head>
  <meta charset="utf-8">
  <title>Subset of a string</title>
  </head>
  <body>
</body>
  </html>

JavaScript Code:

String.prototype.sub_String = function() 
{
  var subset = [];
  for (var m = 0; m < this.length; m++) 
  {
    for (var n = m+1; n<this.length+1; n++) 
    {
      subset.push(this.slice(m,n));
    }
  }
  return subset;
};

console.log("dog".sub_String());

Sample Output:

["d","do","dog","o","og","g"]

Flowchart:

Live Demo:

See the Pen javascript-object-exercise-7 by w3resource (@w3resource) on CodePen.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04