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JavaScript: Check whether a given string represents a correct sentence or not

JavaScript Basic: Exercise-114 with Solution

Write a JavaScript program to check whether a given string represents a correct sentence or not. A string is considered correct sentence if it starts with the capital letter and ends with a full stop (.).

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title> Check whether a given string represents a correct sentence or not</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function is_correct_Sentence(input_str) {
    var first_char = input_str[0];
    var last_char = input_str[input_str.length - 1];
    return /[A-Z]/.test(first_char) && last_char == "."
}
console.log(is_correct_Sentence("This tool will help you write better English and efficiently corrects texts."));
console.log(is_correct_Sentence("This tool will help you write better English and efficiently corrects texts"));            
console.log(is_correct_Sentence("this tool will help you write better English and efficiently corrects texts."));

Sample Output:

true
false
false

Flowchart:

Flowchart: JavaScript - Check whether a given string represents a correct sentence or not

ES6 Version:

function is_correct_Sentence(input_str) {
    const first_char = input_str[0];
    const last_char = input_str[input_str.length - 1];
    return /[A-Z]/.test(first_char) && last_char == "."
}
console.log(is_correct_Sentence("This tool will help you write better English and efficiently corrects texts."));
console.log(is_correct_Sentence("This tool will help you write better English and efficiently corrects texts"));            
console.log(is_correct_Sentence("this tool will help you write better English and efficiently corrects texts."));

Live Demo:

See the Pen javascript-basic-exercise-114 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript program to calculate the sum n + n/2 + n/4 + n/8 + .... where n is a positive integer and all divisions are integer.
Next: Write a JavaScript program to check whether a matrix is a diagonal matrix or not.

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JavaScript: Tips of the Day

Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters)

Example:

const isAnagram = (str1, str2) => {
  const normalize = str =>
    str
      .toLowerCase()
      .replace(/[^a-z0-9]/gi, '')
      .split('')
      .sort()
      .join('');
  return normalize(str1) === normalize(str2);
};
console.log(isAnagram('iceman', 'cinema')); // true

Output:

true