Numbers are one of the most fundamental data types in JavaScript. They can be used to represent a wide variety of values, from simple integers to complex floating-point numbers. JavaScript also provides a number of built-in properties that can be used to manipulate and query numbers.
Standard Number Properties
The following table lists the standard Number properties:
Property | Description |
---|---|
EPSILON | The smallest positive number that can be represented accurately by JavaScript. |
MAX_SAFE_INTEGER | The largest integer that can be represented accurately by JavaScript without losing precision. |
MAX_VALUE | The largest possible numeric value that can be represented by JavaScript. |
MIN_SAFE_INTEGER | The smallest integer that can be represented accurately by JavaScript without losing precision. |
MIN_VALUE | The smallest possible numeric value that can be represented by JavaScript. |
NaN | The special value “Not a Number”. |
NEGATIVE_INFINITY | The special value “Negative Infinity”. |
POSITIVE_INFINITY | The special value “Positive Infinity”. |
These properties can be accessed using the Number
object. For example, to get the largest possible numeric value that can be represented by JavaScript, you would use the following code:
const maxValue = Number.MAX_VALUE;
Using Number Properties
The standard Number properties can be used in a variety of ways. For example, you can use them to check whether a number is within a certain range, or to convert a number to a different format.
Here are a few examples:
// Check if a number is within the range of safe integers.const isSafeInteger = (number) => {
return number >= Number.MIN_SAFE_INTEGER && number <= Number.MAX_SAFE_INTEGER;
};
// Convert a number to exponential notation.const toExponential = (number) => {
return number.toExponential();
};
// Convert a number to a string with two decimal places.const toFixed = (number) => {
return number.toFixed(2);
};
Other Number Properties
In addition to the standard Number properties, there are a number of other Number properties that can be used to manipulate and query numbers. These properties are defined on the Number.prototype
object.
For example, the Number.prototype.isFinite()
method can be used to check whether a number is a finite number. The Number.prototype.isNaN()
method can be used to check whether a number is the special value NaN
.
Here are a few examples:
// Check if a number is a finite number.const isFinite = (number) => {
return number.isFinite();
};
// Check if a number is the special value NaN.
const isNaN = (number) => {
return number.isNaN();
};
// Get the absolute value of a number.const abs = (number) =>; {
return Math.abs(number);
};
Conclusion
JavaScript Number properties provide a variety of ways to manipulate and query numbers. By understanding how to use these properties, you can write more efficient and robust JavaScript code.