locutus/esm/rust/str/strip_prefix.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

export function strip_prefix(prefix, str) {
    //      discuss at: https://locutus.io/rust/strip_prefix/
    // parity verified: Rust 1.85
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //          note 1: Returns the remainder after the first matching prefix, or null when the prefix is absent.
    //       example 1: strip_prefix('foo:', 'foo:bar')
    //       returns 1: 'bar'
    //       example 2: strip_prefix('bar', 'foo:bar')
    //       returns 2: null
    //       example 3: strip_prefix('', 'abc')
    //       returns 3: 'abc'
    const source = String(str);
    const value = String(prefix);
    if (!source.startsWith(value)) {
        return null;
    }
    return source.slice(value.length);
}