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JavaScript: Check whether the first character of a string is uppercase or not

JavaScript validation with regular expression: Exercise-1 with Solution

Write a JavaScript program to test the first character of a string is uppercase or not.

Pictorial Presentation:

JavaScript: Check whether the first character of a string is uppercase or not

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JavaScript Regular expression to check string's first character is uppercase or not</title>
</head>
<body>
</body>
</html>

JavaScript Code:

function upper_case(str)
{
   regexp = /^[A-Z]/;
   if (regexp.test(str))
    {
      console.log("String's first character is uppercase");
    } 
    else
    {
      console.log("String's first character is not uppercase");
    }
}
upper_case('Abcd');
upper_case('abcd');

Sample Output:

String's first character is uppercase
String's first character is not uppercase

Flowchart:

Flowchart: JavaScript- Check whether the first character of a string is uppercase or not

Live Demo:

See the Pen javascript-regexp-exercise-1 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

Assigns default values for all properties in an object that are undefined

Example:

const tips_defaults = (obj, ...defs) => Object.assign({}, obj, ...defs.reverse(), obj);
console.log(tips_defaults({ p: 1 }, { q: 2 }, { q: 6 }, { p: 3 })); 

Output:

[object Object] {
  p: 1,
  q: 2
}