如何修改嵌套深层JavaScript对象：将issueKey追加到指定属性字符串末尾

No need to overcomplicate this—here's a straightforward way to modify your nested object as requested:

Step-by-Step Implementation #

First, let's start with your original object:

const a = { 
  elementErrors: { 
    errorMessages: [], 
    errors: { 
      project: "Issues with this Issue Type must be created in the same project as the parent." 
    } 
  }, 
  issueKey: "JP-55", 
  status: 400 
};

To append the issueKey to the error message in parentheses, simply access the nested error string and concatenate the formatted issueKey using a template literal:

// Append the issueKey wrapped in parentheses
a.elementErrors.errors.project += ` (${a.issueKey})`;

Result #

After running that line, your object will look exactly like the desired output:

const a = { 
  elementErrors: { 
    errorMessages: [], 
    errors: { 
      project: "Issues with this Issue Type must be created in the same project as the parent (JP-55)." 
    } 
  }, 
  issueKey: "JP-55", 
  status: 400 
};

Optional: Add Safety Checks #

If there's a chance the nested properties might be missing (e.g., no project error exists), you can add guard clauses to avoid runtime errors:

// Check if all required properties exist before modifying
if (a.elementErrors?.errors?.project && a.issueKey) {
  a.elementErrors.errors.project += ` (${a.issueKey})`;
}

This uses optional chaining (?.) to safely access nested properties, ensuring the code only runs if everything is present.

内容的提问来源于stack exchange，提问作者Jorge Guerreiro