In your definition private _noop: () => {}; _noop is typed as a function returning an object. When you assign it as this._noop = () => { }; the function you are trying to assign to _noop is of type () => void. If you wanted _noop to be function returning nothing then type it … Read more
The simplest no-op is just having no code at all: #define noop Then user code will have: if (condition) noop; else do_something(); The alternative that you mention is also a no-op: (void)0;, but if you are going to use that inside a macro, you should leave the ; aside for the caller to add: #define … Read more
Recent GAS in binutils has a .nops N pseudo-instruction that expands to the requested number of bytes for the target: .nops size[, control]
NOP is a one-byte “do nothing” operation, quite literally “no operation”. NOPW, NOPL, etc.. are the equivalent do-nothings, but take up word and long-sized bytes. e.g. NOP // 1byte opcode NOP // 1byte opcode is equivalent to doing NOPW // 2byte opcode. They’re very handy for padding things out so a code sequence begins on … Read more
This function was proposed due to performance issues on embedded systems when using $.ajax, reported on the jQuery-Dev mailing list. You can see the thread. Basically, they preferred to introduce and use this single empty function, rather than declaring empty anonymous functions all around. Now this function is internally used in the ajax, event and … Read more
If you really want noop, then this defines a nameless action that doesn’t do anything, and then invokes it, causing nothing to happen: ((Action)(() => { }))();
Some attacks consist of making the program jump to a specific address and continue running from there. The injected code has to be loaded previously somehow in that exact location. Stack randomization and other runtime differences may make the address where the program will jump impossible to predict, so the attacker places a NOP sled … Read more
It’s there more for historical reasons. The colon builtin : is exactly equivalent to true. It’s traditional to use true when the return value is important, for example in an infinite loop: while true; do echo ‘Going on forever’ done It’s traditional to use : when the shell syntax requires a command but you have … Read more
The no-op command in shell is : (colon). if [ “$a” -ge 10 ] then : elif [ “$a” -le 5 ] then echo “1” else echo “2” fi From the bash manual: : (a colon) Do nothing beyond expanding arguments and performing redirections. The return status is zero.