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Stage 0 Draft / December 16, 2024

String.prototype.splice

1 String.prototype.splice ( `start`, `deleteCount`, ...`items` )

The splice method modifies the string by removing or replacing existing characters and/or adding new characters.

1.1 Description

When the splice method is called with an optional start index, optional deleteCount, and zero or more items, the following steps are taken:

1.2 Parameters

stringValue: The string to be modified.
start: The index at which to start changing the string. If negative, it will count from the end of the string. If omitted, defaults to 0.
deleteCount: An integer indicating the number of characters to remove. If omitted, all characters from start to the end of the string will be removed.
...items: The elements to add to the string, beginning from start.

1.3 Runtime Semantics: StringSplice ( . . . )

Let str be ? ToString(stringValue).
Let len be the length of str.
Let relativeStart be 0.
If start is not undefined, set relativeStart to ? ToIntegerOrInfinity(start).
5. Let actualStart be the result of:
1. If relativeStart is negative, compute max(len + relativeStart, 0).
2. Otherwise, compute min(relativeStart, len).
Let actualDeleteCount be len - actualStart.
If deleteCount is not undefined, set actualDeleteCount to ? ToIntegerOrInfinity(deleteCount).
8. Let result be the string consisting of:
1. The substring from index 0 to actualStart (exclusive).
2. The substring from actualStart + actualDeleteCount to the end of the string.
3. All items, concatenated in order.
Return result.

A Copyright & Software License

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