JS Variable Archives

JavaScript concatenate string and variable | Simple example code

Posted March 10, 2021March 10, 2021 by Rohit

To make a string out of a string and a passed variable in JS use concatenation to combine the variable to another string. Simply just add a plus sign+ between the strings or string variables you want to connect.

<script>
		let animal = 'Horse';
		console.log('My favorite animal is the ' + animal + '.'); 
	</script>

let animal = 'Horse';

console.log('My favorite animal is the ' + animal + '.');

</script>

JavaScript concatenate string and variable Example HTML example code:- String and String variable or String Read More…

JavaScript access variable outside the callback | Example code

Posted March 9, 2021March 9, 2021 by Rohit

You can define the variable in function and pass it to callback function in JavaScript. The callback function should have a parameter option. Access to a variable outside of a callback function in javascript HTML example code:-

<html>
<body>

	<script>
		function displayResult(res) {
			console.log(res)
		}

		function addNum(num1, num2, myCallback) {
			var sum;
			sum = num1 + num2;

			myCallback(sum);
		}

		// Test case
		addNum(10, 5, displayResult);


	</script>
</body>
</html>

<html>

<body>

function displayResult(res) {

console.log(res)

}

function addNum(num1, num2, myCallback) {

var sum;

sum = num1 + num2;

myCallback(sum);

}

// Test case

addNum(10, 5, displayResult);

</script>

</body>

</html>

Output: Do comment if you have any doubts and suggestion on this JS variable topic. RohitDegree in Read More…