On the Corialization principle of JS function

1. Why does this function run?

function _add(a) {
    return function(b) {
        return function(c) {
            return a + b + c;
        }
    }
}
_add(1)(2)(3);
Apr.07,2021

this is a little complicated. Write a simple one:

   

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b2bb4d-2b001.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2bb4d-2b001.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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