locutus/esm/kotlin/collections/zipWithNext.js

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

export function zipWithNext(values, transform) {
    //  discuss at: https://locutus.io/kotlin/collections/zipWithNext/
    // original by: Kevin van Zonneveld (https://kvz.io)
    //      note 1: Produces adjacent pairs or transformed adjacent values, like Kotlin zipWithNext.
    //   example 1: zipWithNext([1, 2, 3, 4])
    //   returns 1: [[1, 2], [2, 3], [3, 4]]
    //   example 2: zipWithNext([1, 2, 3, 4], (a, b) => b - a)
    //   returns 2: [1, 1, 1]
    //   example 3: zipWithNext(['a'])
    //   returns 3: []
    if (!Array.isArray(values) || values.length < 2) {
        return [];
    }
    const out = [];
    for (let i = 0; i < values.length - 1; i++) {
        const current = values[i];
        const next = values[i + 1];
        if (transform) {
            ;
            out.push(transform(current, next));
        }
        else {
            ;
            out.push([current, next]);
        }
    }
    return out;
}