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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 a correct sentence if it starts with a 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

Randomizes the order of the values of an array, returning a new array

Example:

const tips_shuffle = ([...arr]) => {
  let x = arr.length;
  while (x) {
    const i = Math.floor(Math.random() * x--);
    [arr[x], arr[i]] = [arr[i], arr[x]];
  }
  return arr;
};
const foo = [2, 4, 6];
console.log(tips_shuffle(foo));

Output:

[4, 2, 6]

 

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