Use strict equality operator === to check for JavaScript equals string. This has the advantages of being the most efficient and reducing the chances of buggy or uncertain code.
Source: MDN Web Docs: Strict Equality.
If you know they are strings, then there’s no need to check for type.
"a" == "b"However, note that string objects will not be equal.
new String("a") == new String("a") //falseCall the valueOf() method to convert it to a primitive for String objects,
new String("a").valueOf() == new String("a").valueOf()//trueString equals in JavaScript
Simple example code.
<!DOCTYPE html>
<html>
<body>
<script>
var a = "hello1";
var b = "hello1";
var c = "hello2";
console.log("a === a?", (a === a));
console.log("a === b?", (a === b));
console.log("a === c?", (a === c));
</script>
</body>
</html>
Output:
You can also use the == operator, which checks only the value and performs type coercion if necessary. However, it’s generally recommended to use === for strict equality checks to avoid unexpected behavior.
Alphabetical Comparisons
If you want to compare two strings to know if a string comes before or after another string, based on natural sorting, use the <, >, <=, and >= operators. Source: MDN WebDocs for <, >, <=, and >=.
var a = "hello1";
var b = "hello2";
console.log("a < a?" + (a < a));
console.log("a < b?" + (a < b));
console.log("a > b?" + (a > b));
console.log("b > a?" + (b > a));Output:
a < a?false
a < b?true
a > b?false
b > a?trueDo comment if you have any doubts or suggestions on this Js string topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version