For the common case, use str.slice(0, -1). It returns a new string with the final UTF-16 code unit removed; it does not change the original string. If by “character” you mean a whole visible symbol, choose a Unicode-aware approach instead.
Remove the final UTF-16 code unit
TypeScript uses JavaScript string values, so JavaScript’s slice method works directly:
const shortened = str.slice(0, -1);The negative end index counts back from the string’s end. The result includes everything before the final code unit and excludes that last unit. Since strings are immutable, assign or return the result rather than expecting str itself to change. If str is empty, the result is also an empty string. TypeScript’s basic types guidance describes strings as primitive values.
Choose the unit you actually want to remove
In everyday language, “character” can mean a UTF-16 code unit, a Unicode code point, or a user-perceived character. Those are not always the same thing.
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| What to remove | Approach | Important distinction |
|---|---|---|
| Final UTF-16 code unit | str.slice(0, -1) |
Concise; can remove only half of a surrogate pair. |
| Final Unicode code point | Array.from(str).slice(0, -1).join("") |
Handles surrogate pairs as one code point, but treats combining marks separately from their base characters. |
| Final user-perceived character, or grapheme cluster | Use grapheme segmentation, such as Intl.Segmenter where supported by the target runtime. |
Suitable for sequences such as a base letter plus a combining mark or multi-code-point emoji; check support in the runtime you target. |
Why a visible symbol can be split
JavaScript string indexing and length are based on UTF-16 code units. Some symbols, including supplementary-plane characters such as 𠮷, are encoded as a pair of code units. Removing one final code unit from a string ending in that symbol can leave half of the surrogate pair, not remove the complete symbol. The TypeScript 1.5 release notes explain this encoding for 𠮷.
Even code-point-aware removal may not match what a person sees as one character: a letter and its combining mark are separate code points, and some emoji are sequences of multiple code points. For text-editing behavior, decide whether your requirement is about code points or grapheme clusters, then test that behavior against the text your application handles.
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Make the function’s behavior clear
If the function removes a code unit, name it accordingly:
function removeLastCodeUnit(value: string): string {
return value.slice(0, -1);
}Use the primitive TypeScript type string, not the boxed String type; the TypeScript handbook’s basic types guidance recommends primitive types.
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