JavaScript ternary operator comparison is not ==

JavaScript is a scripting language widely used in web development and is an important means to achieve interactive effects. It is known as one of the "Troika of the Internet" (HTML, CSS, JS) and is becoming an important part of modern web development.

The ternary operator is a concise and powerful tool when using conditional statements in JavaScript. It helps us compare conditions in a single statement and perform appropriate actions based on the results.

In JavaScript, conditional statements if...then...domain standards use if or switch statements. However, the ternary operator can also do the same thing, but it only requires one line of code. It has the following structure:

(condition) ? trueReturnValue : falseReturnValue;

The first part of this form is the conditional statement, and ? and: are the delimiters in the syntax structure. If the conditional statement is true, the value to the left of the escape character is returned. Otherwise, the value on the right is returned.

The ternary operator can be used to compress multiple if/else statements into one statement. For example, if you want to compare two variables and set a common value based on the result of the variable value, you can use the following statement:

let result = (num1 == num2) ? "Equal" : "Not equal ";

This line of code is the same as the following code:

let result;
if (num1 == num2) {
result = "Equal";
} else {
result = "Not equal";
}

Although the ternary operator seems simple, it is useful for JavaScript beginners, as well as for those who may be used to other programming languages. or other comparison operators, this may cause some confusion. In particular, we need to understand the use of comparison operators. When using the ternary operator, you need to pay attention to avoid the following errors:

1. Do not confuse the == (equality) and === (identity) operators;
2. Ternary operation operator can only be used for simple comparison conditions, so when you need to continue nested conditional statements, you should choose if/else;
3. Do not rely too much on the ternary operator to improve the readability and maintainability of the code. More important than simplicity.

In addition, the ternary operator has a disadvantage, that is, it is inconvenient to prompt errors. When an error occurs, its error message in the console is inaccurate and can cause additional trouble.

The ternary operator is one of the very useful tools in JavaScript. It can be used to simplify code and compare conditions and perform corresponding operations. While we need to be careful about using comparison operators and avoid errors, using this concise yet powerful language construct can make our code cleaner and easier to maintain.

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