mengatur
@echo off
set a[0]=1
set a[1]=2
set a[2]=3
Rem Setting the new value for the second element of the array
Set a[1]=5
echo The new value of the second element of the array is %a[1]%
@echo off
set a[0]=1
set a[1]=2
set a[2]=3
Rem Setting the new value for the second element of the array
Set a[1]=5
echo The new value of the second element of the array is %a[1]%set [--abefhkmnptuvxBCEHPT] [-o option-name] [argument …]
set [+abefhkmnptuvxBCEHPT] [+o option-name] [argument …]Set<String> names = new HashSet<>();
names.add("John");
names.add("Jack");
names.add("John");
System.out.println(names); // [John, Jack]
names.remove("John");
boolean contains = names.contains("Jack"); // true
for (String name: names) {
System.out.println(name);
}num |= 1 << x; //SET // https://mongodb.github.io/node-mongodb-native/markdown-docs/insert.html
//To update only selected fields, $set operator needs to be used. Following replacement object replaces author value but leaves everything else intact.
collection.update({_id:"123"}, {$set: {author:"Jessica"}});