Summary of JS data type conversion

There are two types of data type conversion in JS: forced type conversion and implicit type conversion. This article mainly shares with you a summary of JS data type conversion, hoping to help everyone.

Implicit type conversion principle

1. are all numbers, direct operations

2. are all strings, use the corresponding characters ASCII value operation

3. One of them is a boolean value, convert the boolean value into a number, true->1 or false->0

4. One of them is a number, convert the other one into a number

5. If there is NaN, the result is NaN or false

Convert the reference type to Primitive type analysis

Four operating functions are defined inside JS

• ToPrimitive(obj, [PreferredType])
  obj: The object to be converted
  PreferredType: The target type to be converted (only accepts Number and String types, the default is empty), if obj is Date, then PreferredType=String, in other cases PreferredType=Number

• ##ToNumber(arguments)

• ToString(arguments)

• ##ToBoolean(arguments)

Here is an example of converting an object to a number

to Number

Convert to String

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