What is the purpose of mapping through Object.keys(this) and accessing each property using this[key]?

After reviewing this method, I can't help but wonder why it uses

Object.keys(this).map(key => (this as any)[key])
. Is there any reason why
Object.keys(this).indexOf(type) !== -1
wouldn't work just as well?

/**
 * Checks if validation type is valid.
 */
static isValid(type: string) {
    return  type !== "isValid" &&
        type !== "getMessage" &&
        Object.keys(this).map(key => (this as any)[key]).indexOf(type) !== -1;
} 

Answer №1

The code in question does not generate an array of keys from the object, but rather creates an array of the values and then checks if the specific type is present within that array. To enhance clarity, it could be written as follows:

/**
 * Validates the type for validity.
 */
static isValid(type: string) {
  return  type !== "isValid" && 
    type !== "getMessage" &&
    Object.values(this).includes(type);
} 

(Utilizing polyfills whenever necessary)

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