計算屬性名稱如何增強 JavaScript 物件文字中的動態屬性建立？

Understanding Computed Property Names in Object Literals

In ES6, JavaScript introduced a new feature called computed property names, represented by square brackets around property names in object literals. These computed names allow for dynamic property names, making it possible to dynamically create and access properties based on variables or expressions.

A recent example of this is:

dist: {
  files: {
    [bpr + 'lib/Monster.min.js']: ['<%= concat.dist.dest %>']
  }
}

Here, the property name is a computed value [bpr + 'lib/Monster.min.js']. It takes the value of bpr and concatenates it with the string 'lib/Monster.min.js' to create the property name. The square brackets around the expression make it a computed property.

Advantages of Computed Property Names:

• Dynamic property names: Computed names allow for flexibility in creating property names based on runtime data or calculations.
• Enhanced readability: Using variables or expressions as property names can improve code readability and make it easier to identify the purpose of properties.
• Improved code reusability: Computed names allow for creating generic functions or components that can be used with different property names, improving code reusability.

Syntax:

The syntax for a computed property name is:

[expression]

Where expression can be any valid JavaScript expression that evaluates to a string, symbol, or number.

Limitations:

• Computed property names cannot be used as shorthand properties.
• The property key must be a valid JavaScript identifier or a string literal.
• The expression must evaluate to a valid property name.

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