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116 lines
3.0 KiB
Markdown
116 lines
3.0 KiB
Markdown
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
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[Home](./index.md) > [bitburner](./bitburner.md) > [NS](./bitburner.ns.md) > [flags](./bitburner.ns.flags.md)
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## NS.flags() method
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Parse command line flags.
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**Signature:**
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```typescript
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flags(schema: [string, string | number | boolean | string[]][]): { [key: string]: ScriptArg | string[] };
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```
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## Parameters
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<table><thead><tr><th>
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Parameter
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</th><th>
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Type
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</th><th>
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Description
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</th></tr></thead>
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<tbody><tr><td>
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schema
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</td><td>
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\[string, string \| number \| boolean \| string\[\]\]\[\]
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</td><td>
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</td></tr>
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</tbody></table>
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**Returns:**
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{ \[key: string\]: [ScriptArg](./bitburner.scriptarg.md) \| string\[\] }
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## Remarks
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RAM cost: 0 GB
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Allows Unix-like flag parsing.
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We support 2 forms:
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- Short form: the flag contains only 1 character, e.g. -v.
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- Long form: the flag contains more than 1 character, e.g. --version.
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Note that if an argument is given and its default value is nullish, the parsed value will be a string. This may cause subtle issues if you are not careful with type coercion.
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## Example
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```js
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export async function main(ns) {
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const data = ns.flags([
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['delay', 0], // a default number means this flag is a number
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['server', 'foodnstuff'], // a default string means this flag is a string
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['exclude', []], // a default array means this flag is a default array of string
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['help', false], // a default boolean means this flag is a boolean
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['v', false], // short form
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]);
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ns.tprint(data);
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}
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// [home /]> run example.js
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// {"_":[],"delay":0,"server":"foodnstuff","exclude":[],"help":false,"v":false}
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// [home /]> run example.js --delay 3000
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// {"_":[],"delay":3000,"server":"foodnstuff","exclude":[],"help":false,"v":false}
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// [home /]> run example.js --delay 3000 --server harakiri-sushi
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// {"_":[],"delay":3000,"server":"harakiri-sushi","exclude":[],"help":false,"v":false}
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// [home /]> run example.js --delay 3000 --server harakiri-sushi hello world
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// {"_":["hello","world"],"delay":3000,"server":"harakiri-sushi","exclude":[],"help":false,"v":false}
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// [home /]> run example.js --delay 3000 --server harakiri-sushi hello world --exclude a --exclude b
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// {"_":["hello","world"],"delay":3000,"server":"harakiri-sushi","exclude":["a","b"],"help":false,"v":false}
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// [home /]> run example.js --help
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// {"_":[],"delay":0,"server":"foodnstuff","exclude":[],"help":true,"v":false}
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// [home /]> run example.js -v
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// {"_":[],"delay":0,"server":"foodnstuff","exclude":[],"help":false,"v":true}
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```
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```js
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export async function main(ns) {
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const data = ns.flags([
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["foo", null],
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["bar", undefined],
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]);
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console.log(data);
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}
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// [home /]> run example.js
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// { _: [], foo: null, bar: undefined }
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// [home /]> run example.js --foo 1000
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// { _: [], foo: "1000", bar: undefined }
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// [home /]> run example.js --foo 1000 --bar false
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// { _: [], foo: "1000", bar: "false" }
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```
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`bar` in the last example is `"false"` (a string), not `false` (a boolean). `data.bar` is truthy, not falsy.
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