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doc: clean up and streamline vm.md examples

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PR-URL: https://github.com/nodejs/node/pull/31474
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
This commit is contained in:
Denys Otrishko 2020-01-23 16:02:40 +02:00 committed by Rich Trott
parent 05d350a360
commit f2d5173b9d
1 changed files with 16 additions and 21 deletions
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37
doc/api/vm.md
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@ -175,9 +175,8 @@ for (let i = 0; i < 10; ++i) {
script.runInContext(context);
}
console.log(util.inspect(context));
// { animal: 'cat', count: 12, name: 'kitty' }
console.log(context);
// Prints: { animal: 'cat', count: 12, name: 'kitty' }
```
Using the `timeout` or `breakOnSigint` options will result in new event loops
@ -246,9 +245,8 @@ contexts.forEach((context) => {
script.runInNewContext(context);
});
console.log(util.inspect(contexts));
// [{ globalVar: 'set' }, { globalVar: 'set' }, { globalVar: 'set' }]
console.log(contexts);
// Prints: [{ globalVar: 'set' }, { globalVar: 'set' }, { globalVar: 'set' }]
```
### `script.runInThisContext([options])`
@ -804,9 +802,11 @@ vm.createContext(context);
vm.runInContext('globalVar *= 2;', context);
console.log(util.inspect(context)); // { globalVar: 2 }
console.log(context);
// Prints: { globalVar: 2 }
console.log(util.inspect(globalVar)); // 3
console.log(global.globalVar);
// Prints: 3
```
If `contextObject` is omitted (or passed explicitly as `undefined`), a new,
@ -906,9 +906,8 @@ vm.createContext(contextObject);
for (let i = 0; i < 10; ++i) {
vm.runInContext('globalVar *= 2;', contextObject);
}
console.log(util.inspect(contextObject));
// { globalVar: 1024 }
console.log(contextObject);
// Prints: { globalVar: 1024 }
```
## `vm.runInNewContext(code[, contextObject[, options]])`
@ -1003,9 +1002,8 @@ const contextObject = {
};
vm.runInNewContext('count += 1; name = "kitty"', contextObject);
console.log(util.inspect(contextObject));
// { animal: 'cat', count: 3, name: 'kitty' }
console.log(contextObject);
// Prints: { animal: 'cat', count: 3, name: 'kitty' }
```
## `vm.runInThisContext(code[, options])`
@ -1075,15 +1073,12 @@ const vm = require('vm');
let localVar = 'initial value';
const vmResult = vm.runInThisContext('localVar = "vm";');
console.log('vmResult:', vmResult);
console.log('localVar:', localVar);
console.log(`vmResult: '${vmResult}', localVar: '${localVar}'`);
// Prints: vmResult: 'vm', localVar: 'initial value'
const evalResult = eval('localVar = "eval";');
console.log('evalResult:', evalResult);
console.log('localVar:', localVar);
// vmResult: 'vm', localVar: 'initial value'
// evalResult: 'eval', localVar: 'eval'
console.log(`evalResult: '${evalResult}', localVar: '${localVar}'`);
// Prints: evalResult: 'eval', localVar: 'eval'
```
Because `vm.runInThisContext()` does not have access to the local scope,