How to compare two strings - JavaScript

In this article we will learn how to compare two strings in JavaScript.

It is very common to compare two strings in JavaScript in JavaScript.

Problem

Now we have a problem which is that we want to compare two strings.

There are many ways to compare strings in JavaScript such as:

• Using localeCompare method
• Using Mathematical Operators

Compare two string using localeCompare

We can compare two strings using localeCompare.

Let's see an example

// Strings
const firstString = "A";
const secondString = "Z";

// Compare
const compare = firstString.localeCompare(secondString)

// Result:
console.log(compare);

Output

-1

Result was -1 because secondString greater than firstString in the alphabetical order.

Another Example

// Strings
const firstString = "Z";
const secondString = "A";

// Compare
const compare = firstString.localeCompare(secondString)

// Result:
console.log(compare);

Output

1

Result was 1 because firstString greater than secondString in the alphabetical order.

What about if two strings are equal?

// Strings
const firstString = "A";
const secondString = "A";

// Compare
const compare = firstString.localeCompare(secondString)

// Result:
console.log(compare);

Output

0

locaelCompare returns:

• 1 if firstString is greater than secondString
• -1 if firstString is smaller than secondString
• 0 if firstString and secondString are equal in the alphabetical order.

Compare two strings using Mathematical Operators

You can also use mathematical operators when comparing strings.

Example

// Strings
const firstString = "A";
const secondString = "Z";

// Tests:
console.log(firstString > secondString);
console.log(firstString < secondString);
console.log(firstString == secondString);

Output

false
true
false

Thank you for reading

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