selectVariant
KIT · function · 运行时值
Pick one variant, avoiding an immediate repeat when alternatives exist.
When every candidate equals previous, the full list is used again, so a single-value set still yields a result instead of failing.
导入
ts
import { selectVariant } from '@jangts/agent-core/kits/presentation';js
import { selectVariant } from '@jangts/agent-core/kits/presentation';其他公开入口：@jangts/agent-core/types、@jangts/agent-core/kits/presentation、@jangts/agent-core/kits。
定义
泛型参数
| 类型参数 | 约束 | 默认类型 |
|---|---|---|
Value | — | — |
调用
ts
selectVariant<Value>(values: readonly Value[], options: { previous?: Value; randomIndex(limit: number): number; }): Value | undefinedPick one variant, avoiding an immediate repeat when alternatives exist.
When every candidate equals previous, the full list is used again, so a single-value set still yields a result instead of failing.
| 类型参数 | 约束 | 默认类型 |
|---|---|---|
Value | — | — |
| 参数 | 类型 | 传递 | 说明 |
|---|---|---|---|
values | readonly Value[] | 必需 | — |
options | { previous?: Value; randomIndex(limit: number): number; } | 必需 | — |
options 的字段
| 字段 | 类型 | 必需 | 说明 |
|---|---|---|---|
previous | Value | undefined | 可省略 | 见类型定义及调用场景。 |
randomIndex | (limit: number) => number | 必需 | 见类型定义及调用场景。 |
返回： Value \| undefined。
等待后的值： Awaited<Value> \| undefined。
使用示例
- 模板、语义槽与表达选择：程序拥有模板和偏好顺序，插入值只替换一次，变体随机源由 App 提供。
先用程序模板组合说明
入门 · Node.js
ts
import { Presentation } from '@jangts/agent-core/kits/presentation';
const template = Presentation.defineTextTemplate('你好，{{name}}。{{body}}');
console.log(template.render({ name: '开发者', body: '普通对象也能实现接口。' }));js
import { Presentation } from '@jangts/agent-core/kits/presentation';
const template = Presentation.defineTextTemplate('你好，{{name}}。{{body}}');
console.log(template.render({ name: '开发者', body: '普通对象也能实现接口。' }));相同模板加语义键校验与不重复变体
配置 · Node.js
ts
import { Presentation } from '@jangts/agent-core/kits/presentation';
const slots = Presentation.defineSemanticSlots({ namespace: 'tone', keys: ['brief', 'detailed'], maxOccurrences: 1 });
console.log(slots.isValid('{{tone:brief}}'));
const greeting = Presentation.selectVariant(['你好', '欢迎'], { previous: '你好', randomIndex: () => 0 });
const tone = Presentation.resolvePreference([{ value: 'brief', priority: 1, order: 0 }, { value: 'detailed', priority: 2, order: 1 }]);
const template = Presentation.defineTextTemplate('{{greeting}}，{{body}}');
console.log(template.render({ greeting: greeting ?? '你好', body: tone === 'detailed' ? '下面逐步说明接口。' : '普通对象即可。' }));js
import { Presentation } from '@jangts/agent-core/kits/presentation';
const slots = Presentation.defineSemanticSlots({ namespace: 'tone', keys: ['brief', 'detailed'], maxOccurrences: 1 });
console.log(slots.isValid('{{tone:brief}}'));
const greeting = Presentation.selectVariant(['你好', '欢迎'], { previous: '你好', randomIndex: () => 0 });
const tone = Presentation.resolvePreference([{ value: 'brief', priority: 1, order: 0 }, { value: 'detailed', priority: 2, order: 1 }]);
const template = Presentation.defineTextTemplate('{{greeting}}，{{body}}');
console.log(template.render({ greeting: greeting ?? '你好', body: tone === 'detailed' ? '下面逐步说明接口。' : '普通对象即可。' }));