commonPrefixLength

CORE · function · Runtime value

Length of the longest common prefix of two strings.

Implemented as a binary search over slice comparisons so long prompts stay on the native string comparison path instead of running a JavaScript character loop.

Import

TypeScript

import { commonPrefixLength } from '@jangts/agent-core/context';

JavaScript

import { commonPrefixLength } from '@jangts/agent-core/context';

Other public entry points:@jangts/agent-core, @jangts/agent-core/types, @jangts/agent-core/context, @jangts/agent-core/support, @jangts/agent-core/support/context.

Definition

Call

commonPrefixLength(left: string, right: string): number

Length of the longest common prefix of two strings.

Implemented as a binary search over slice comparisons so long prompts stay on the native string comparison path instead of running a JavaScript character loop.

Parameter	Type	Passing	Description
left	string	Required	—
right	string	Required	—

Returns: number.

Examples

• Structural query keys and text common prefixes: Small pure functions for stable comparison and usage analysis, not an authorization, hashing, or semantic deduplication system.

Compare the stable prefix of two real inputs

Beginner · Node.js

TypeScript

import { commonPrefixLength } from '@jangts/agent-core';
console.log(commonPrefixLength('服务：正常', '服务：繁忙')); // 3

JavaScript

import { commonPrefixLength } from '@jangts/agent-core';
console.log(commonPrefixLength('服务：正常', '服务：繁忙')); // 3

Different object key order keeps the same structure semantics

Configuration · Node.js

TypeScript

import { retrievalQueryKey } from '@jangts/agent-core';
const first = retrievalQueryKey({ query: '服务状态', filters: { region: 'cn', active: true } });
const second = retrievalQueryKey({ filters: { active: true, region: 'cn' }, query: '服务状态' });
console.log(first === second); // true
console.log(retrievalQueryKey({ ids: ['a', 'b'] }) === retrievalQueryKey({ ids: ['b', 'a'] })); // false

JavaScript

import { retrievalQueryKey } from '@jangts/agent-core';
const first = retrievalQueryKey({ query: '服务状态', filters: { region: 'cn', active: true } });
const second = retrievalQueryKey({ filters: { active: true, region: 'cn' }, query: '服务状态' });
console.log(first === second); // true
console.log(retrievalQueryKey({ ids: ['a', 'b'] }) === retrievalQueryKey({ ids: ['b', 'a'] })); // false

Related policy source

• Sorting and serialization of structural keys
• Implementation of common prefix comparison