Use the arr.join([separator]) function. The separator specifies a string to separate each pair of adjacent elements of the array. The separator is converted to a string if necessary. If omitted, the array elements are separated with a comma (“,”). If separator is an empty string, all elements are joined without any characters in between them.
private generateBlogPostHeader(commaSeparatedListOfTags: string, snippet: Snippet): string {
let header: string = '';
header += 'categories: [snippets]\n';
header += `tags: [${snippet.tags.join(',')}]\n`;
header += '---\n';
return header;
}
You can also use the toString() method in this particular case with the same result
header += `tags: [${snippet.tags.toString()}]\n`;
Reference - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/join
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