Operators that are not part of javascript

Javascript is a widely used programming language that provides developers with powerful operators and control flow to process and manipulate data. In Javascript, there are some operators that are not widely discussed and used. This article will introduce these operators that are not regular operators in Javascript.

1. Ternary operator ( ? : )

The ternary operator is also called the conditional operator, it is a concise way to write if-else statement. In Javascript, its syntax is:

condition ? expr1 : expr2

When the condition is true, the expression expr1 is executed. When the condition is false, expression expr2 is executed. For example:

var age = 18;
var isAdult = age >= 18 ? true : false;
console.log(isAdult); // true

This paragraph The code will determine whether the adult is an adult based on the value of the variable age. If the age is greater than or equal to 18 years old, the isAdult variable is assigned a value of true, otherwise it is assigned a value of false.

2. Comma operator ( , )

The comma operator is a way to separate multiple expressions. The comma operator is also called a sequence operator because it can combine multiple expressions into a sequence. In Javascript, commas are used to separate expressions, for example:

var x = 1, y = 2, z = 3;
console.log(x, y, z); // 1 2 3

In this example, the comma operator is used to declare multiple variables in one statement, and Assign values ​​to them.

3. void operator

The void operator is used to execute an expression but does not return any value. In Javascript, the void operator is followed by any expression and returns undefined. For example:

var result = void 0;
console.log(result); // undefined

In this example, the void 0 operator returns undefined and assigns it to the variable result.

4. delete operator

The delete operator is used to delete attributes of an object or elements of an array. In Javascript, the syntax is as follows:

delete object.property; // Delete the properties of the object
delete array[index]; // Delete the elements of the array

For example:

var obj = {name: 'Jim', age: 18};
delete obj.age;
console.log(obj); // {name: 'Jim'}

In this example, the delete operator is used to delete the age attribute of object obj.

5. instanceof operator

The instanceof operator is used to check whether an object is an instance of a certain class. In Javascript, the syntax is as follows:

object instanceof class

For example:

var arr = [1, 2, 3];
console.log(arr instanceof Array); // true

In this example, the instanceof operator is used to check whether arr is an instance of the Array class.

Summary

The above are less commonly used operators in Javascript, and they may be very useful in specific scenarios. When we master the use of these operators, we can better process and manipulate data. It should be noted that these operators may not be supported by all browsers or Javascript engines and need to be used with caution.

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