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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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Next: Write a JavaScript program to create a new string from a given string, removing the first and last characters of the string if the first or last character are 'P'.

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JavaScript: Tips of the Day

Parameter's value

function getItems(fruitList, ...args, favoriteFruit) {
  return [...fruitList, ...args, favoriteFruit]
}

getItems(["banana", "apple"], "pear", "orange")

...args is a rest parameter. The rest parameter's value is an array containing all remaining arguments, and can only be the last parameter! In this example, the rest parameter was the second parameter. This is not possible, and will throw a syntax error.

function getItems(fruitList, favoriteFruit, ...args) {
  return [...fruitList, ...args, favoriteFruit];
}


getItems(['banana', 'apple'], 'pear', 'orange');
The above example works. This returns the array [ 'banana', 'apple', 'orange', 'pear' ].

Ref: https://bit.ly/3jFRBje