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JavaScript: Test whether the character at the provided character index is upper case

JavaScript String: Exercise-43 with Solution

Write a JavaScript function to test whether the character at the provided (character) index is upper case.

Test Data:
console.log(isUpperCaseAt('Js STRING EXERCISES', 1));
false

Pictorial Presentation:

JavaScript: Test whether the character at the provided character index is upper case

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript function to test whether the character at the provided index is upper case</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function isUpperCaseAt(str, index) {
 return str.charAt(index).toUpperCase() === str.charAt(index);
    }
console.log(isUpperCaseAt('Js STRING EXERCISES', 1));

Sample Output:

false

Flowchart:

Flowchart: JavaScript: Test whether the character at the provided character index is upper case

Live Demo:

See the Pen JavaScript Test whether the character at the provided character index is upper case-string-ex-43 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

var functionName = function() {} vs function functionName() {}

The difference is that functionOne is a function expression and so only defined when that line is reached, whereas functionTwo is a function declaration and is defined as soon as its surrounding function or script is executed (due to hoisting).

For example, a function expression:

// TypeError: functionOne is not a function
functionOne();

var functionOne = function() {
  console.log("Hello!");
};

Historically, function declarations defined within blocks were handled inconsistently between browsers. Strict mode (introduced in ES5) resolved this by scoping function declarations to their enclosing block.

'use strict';    
{ // note this block!
  function functionThree() {
    console.log("Hello!");
  }
}
functionThree(); // ReferenceError

Ref: https://bit.ly/2zMAj1O