Is there a memset function in JavaScript?

There is no memset() function in JavaScript; the memset() function is a "C/C" language initialization function. Its function is to set all the contents in a certain memory to a specified value. This function is usually for new applications. The memory is initialized, and this function cannot be used in JavaScript.

The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.

Is there a memset function in JavaScript?

There is no memset() function in JavaScript

memset is the C/C language initialization function in the computer. Its function is to set all the contents in a certain memory to a specified value. This function usually initializes the newly requested memory.

void *memset(void *s, int ch, size_t n);

Function explanation: Replace the n bytes (typedef unsigned int size_t) following the current position in s with ch and return s.

memset: The function is to fill a given value in a memory block. It is the fastest way to clear a larger structure or array [1].

memset() function prototype is extern void *memset(void *buffer, int c, int count) buffer: is a pointer or array, c: is the value assigned to the buffer, count: is the length of the buffer .

Write a program below:

# include  # include  int main(void) { int i; //循环变量 char str[10]; char *p = str; memset(str, 0, sizeof(str)); //只能写sizeof(str), 不能写sizeof(p) for (i=0; i<10; ++i) { printf("%d\x20", str[i]); } printf("\n"); return 0; }

According to the different memset functions, the output results are also different, which are divided into the following situations:

memset(p, 0, sizeof(p)); //地址的大小都是4字节 0 0 0 0 -52 -52 -52 -52 -52 -52 memset(p, 0, sizeof(*p)); //*p表示的是一个字符变量, 只有一字节 0 -52 -52 -52 -52 -52 -52 -52 -52 -52 memset(p, 0, sizeof(str)); 0 0 0 0 0 0 0 0 0 0 memset(str, 0, sizeof(str)); 0 0 0 0 0 0 0 0 0 0 memset(p, 0, 10); //直接写10也行, 但不专业 0 0 0 0 0 0 0 0 0 0

Related recommendations:javascript learning tutorial

The above is the detailed content of Is there a memset function in JavaScript?. For more information, please follow other related articles on the PHP Chinese website!