JavaScript: Create a new string of 4 copies of the last 3 characters of a given original string
JavaScript Basic: Exercise-58 with Solution
Write a JavaScript program to create a new string of 4 copies of the last 3 characters of a given original string. The length of the given string must be 3 and above.
Pictorial Presentation:
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JavaScript program to create a new string of 4 copies of the last 3 characters of a given original string. The length of the given string must be 3 and above.</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function newstring(str)
{
if (str.length >= 3) {
result_str = str.substring(str.length - 3);
return result_str + result_str + result_str + result_str;
}
else
return false;
}
console.log(newstring("Python 3.0"));
console.log(newstring("JS"));
console.log(newstring("JavaScript"));
Sample Output:
3.03.03.03.0 false iptiptiptipt
Flowchart:
ES6 Version:
function newstring(str)
{
if (str.length >= 3) {
result_str = str.substring(str.length - 3);
return result_str + result_str + result_str + result_str;
}
else
return false;
}
console.log(newstring("Python 3.0"));
console.log(newstring("JS"));
console.log(newstring("JavaScript"));
Live Demo:
See the Pen JavaScript - Create a new string of 4 copies of the last 3 characters of a string - basic-ex-57 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript program to create a new string of specified copies (positive number) of a given string.
Next: Write a JavaScript program to extract the first half of a string of even length.
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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
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