Reposted by Oom Sveta
Axel is perhaps the most professional and diligent JS educating author.
I remember when it felt like a new JS feature wasn't "done" until he had written the corresponding explainer article.
You can thank him by buying his books 📚
![DECLARING MULTIPLE VARIABLES
You can declare multiple variables in any single declaration, but doing so can get confusing if the variables are pointers or arrays, or the variables are different types. For example, the following declarations are all correct:
char *src, c;
int x, y[5];
int m[12], n[15][3], o[21];
The first line declares two variables, src and c, which have different types. The src variable has a type of char *, and c has a type of char. The second line again declares two variables, x and y, with different types. The variable x has a type int, and y is an array of five elements of type int. The third line declares three arrays-m, n, and o—with different dimensions and numbers of elements.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:tbrvzp6dkjlbd6tq5ybao4wi/bafkreicd3rbixq26kovrkl2xbmglwodnmwqyjtv6pmysrdzv2lxtofpphi)
![TYPE DEFINITIONS
You use a typedef to declare an alias for an existing type; it never creates a new type. For example, each of the following declarations creates a new type alias:
typedef unsigned int uint_type;
typedef signed char schar_type, *schar_p, (*fp)(void);
On the first line, we declare uint_type as an alias for the type unsigned int. On the second line, we declare schar_type as an alias for signed char, schar_p as an alias for signed char *, and fp as an alias for signed char(*) (void). Identifiers that end in _t in the standard headers are type definitions (aliases for existing types). Generally speaking, you should not follow this convention in your own code because the C Standard reserve identifiers that match the patterns int[0-9a-z_]*_t and uint[0-9a-z_]*_t, and the Portable Operating System Interface (POSIX) reserves all identifiers that end in _t. If you define identifiers that use these names, they may collide with names used by the implementation, which can cause problems that are difficult to debug.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:tbrvzp6dkjlbd6tq5ybao4wi/bafkreibmzedt7oeukgdleucwfetqxi5kjboyfbxkzzecs7pk2oijh4k2u4)
