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JavaScript: Display the city name if the string begins with "Los" or "New" otherwise return blank

JavaScript Basic: Exercise-66 with Solution

Write a JavaScript program to display the city name if the string begins with "Los" or "New" otherwise return blank.

Pictorial Presentation:

JavaScript: Display the city name if the string begins with 'Los' or 'New' otherwise return blank

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JavaScript program to display the city name  if the string begins with “Los” or “New” otherwise return blank.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function city_name(str) {
  if (str.length >= 3 && ((str.substring(0, 3) == 'Los')
                          || (str.substring(0, 3) == 'New')))
   
      {
          return str;
    }

  return '';
}

console.log(city_name("New York"));
console.log(city_name("Los Angeles"));
console.log(city_name("London"));

Sample Output:

New York
Los Angeles

Flowchart:

Flowchart: JavaScript - Display the city name if the string begins with

ES6 Version:

function city_name(str) {
  if (str.length >= 3 && ((str.substring(0, 3) == 'Los')
                          || (str.substring(0, 3) == 'New')))
   
      {
          return str;
    }

  return '';
}

console.log(city_name("New York"));
console.log(city_name("Los Angeles"));
console.log(city_name("London"));

Live Demo:

See the Pen JavaScript - Display the city name if the string begins with "Los" or "New" otherwise return blank - basic-ex-66 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

Returns the sum of the powers of all the numbers from start to end (both inclusive)

Example:

const sumPower = (end, power = 2, start = 1) =>
  Array(end + 1 - start)
    .fill(0)
    .map((x, i) => (i + start) ** power)
    .reduce((a, b) => a + b, 0);
console.log(sumPower(10)); // 385
console.log(sumPower(10, 3)); // 3025
console.log(sumPower(10, 3, 5)); // 2925

Output:

385
3025
2925