Function substringBefore

substringBefore<T extends string | null = null>(
    s: Nullish,
    delimiter: string | RegExp,
    on_missing?: T,
): T
Returns the substring before the first occurrence of the delimiter.
Type Parameters
- T extends string | null = null
Parameters
- s: Nullish
  Input string, or null/undefined.
- delimiter: string | RegExp
  String or regex marking where to end.
- Optionalon_missing: T
  Returned if s is nullish or delimiter not found (default: null).
Returns T
The substring before the delimiter, or on_missing.
Example
```
substringBefore("path/to/file.txt", '/');     // "path"
substringBefore("abc123xyz", /\d+/);          // "abc"
substringBefore(undefined, ':');              // null
substringBefore("no-needle", ':', 'default'); // 'default'
```
- Defined in src/string/substring.ts:56
substringBefore<T extends string | null = null>(
    s: Nullable<string>,
    delimiter: string | RegExp,
    on_missing?: T,
): string | T
Returns the substring before the first occurrence of the delimiter.
Type Parameters
- T extends string | null = null
Parameters
- s: Nullable<string>
  Input string, or null/undefined.
- delimiter: string | RegExp
  String or regex marking where to end.
- Optionalon_missing: T
  Returned if s is nullish or delimiter not found (default: null).
Returns string | T
The substring before the delimiter, or on_missing.
Example
```
substringBefore("path/to/file.txt", '/');     // "path"
substringBefore("abc123xyz", /\d+/);          // "abc"
substringBefore(undefined, ':');              // null
substringBefore("no-needle", ':', 'default'); // 'default'
```
- Defined in src/string/substring.ts:57

Function substringBefore

Type Parameters

Parameters

Returns T

Example

Type Parameters

Parameters

Returns string | T

Example

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