Top 4 ways to check if a variable is a string in JavaScript

1. Using typeof operator

The recommended solution is to use the typeof operator to determine the type of operand. This is demonstrated below:

const val = ‘Hello World’;
if (typeof val === ‘string’) {
console.log(‘Variable is a string’);
}
else {
console.log(‘Variable is not a string’);
}
/*
Output: Variable is a string
*/

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The typeof operator will return an object for strings created with new String(). This can be handled using the instanceof operator.

const val = new String(‘Hello World’);
if (typeof val === ‘string’ || val instanceof String) {
console.log(‘Variable is a string’);
}
else {
console.log(‘Variable is not a string’);
}
/*
Output: Variable is a string
*/

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2. Using Object.prototype.toString.call() function

Another approach is to find the class of Objects using the toString method from…