How to convert JavaScript numbers to characters and logical types

How can I convert numbers to characters?

Convenient methods are the toString method and the String constructor.

Convert number to string using toString method

To convert a number to a string, toStringuse the methods of the Number object.

variable.toString();

In the example below, the variable num stores the number 123. toStringBy using the method, num is converted to a string and stored in a variable called str. str will be the string “123”.

let num = 123;
let str = num.toString();

Convert numbers to strings using the String function

Another way to convert numbers to strings is to use the String function .

String(variable);

　The String function specifies the string to use when creating the string. Also, if you specify a number or object, it will convert them to a string and return them.

In the example below, the variable num stores the number 123. By using the String constructor, num is converted to a string and stored in a variable called str. str will be the string “123”.

let num = 123;
let str = String(num);

How to convert numbers to logical type

Another way to convert a number to a logical type is to use the Boolean function .

Boolean(variable);

　A Boolean function is a function that converts a specified value to a logical type and returns it. The Boolean function specifies the value to be converted to a logical type. The Boolean function converts a value to a logical type and returns it according to the following rules:

• If 0 or NaN is specified, false is returned.
• If any other number is specified, true is returned.

let num1 = 0;
let bool1 = Boolean(num1);  // bool1はfalse

let num2 = 123;
let bool2 = Boolean(num2);  // bool2はtrue

let num3 = NaN;
let bool3 = Boolean(num3);  // bool3はfalse

In the above example, num1, num2, and num3 store 0, 123, and NaN, respectively. By using the Boolean function, the values ​​converted to logical type are stored in the variables bool1, bool2, and bool3.

Summary of “How to convert numbers to characters and logical types”

The following is a summary of how to convert numbers to characters and logical types .

Which method you use depends on the occasion and your preferences. 
The key is to use data types wisely.