Function precomputedCodePointPredicate

src/Strings.ts:32–40

(p: CodePointPredicate)

type CodePointPredicate = (codePoint: number) => boolean;

function precomputedCodePointPredicate(p: CodePointPredicate): CodePointPredicate {
    const asciiResults: boolean[] = [];
    for (let cp = 0; cp < 128; cp++) {
        asciiResults.push(p(cp));
    }
    return function(cp: number) {
        return cp < 128 ? asciiResults[cp] : p(cp);
    };
}

// FIXME: This is a copy of code in src/Data/String/Util.js
export function utf16ConcatMap(mapper: (utf16Unit: number) => string): (s: string) => string {