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

Last update on May 30 2022 09:59:22 (UTC/GMT +8 hours)

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:

Live Demo:

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

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04