jsmodern/dist/array/split-at.js

An extension to existing JavaScript, influenced by other great languages such as Rust, Dart, Java, Golang, etc.

export const splitAt = {
    label: 'splitAt',
    fn: function arraySplitAt(at) {
        const ctx = this;
        const len = ctx.length;
        if ('number' !== typeof (at) || at < 0 || at > len) {
            throw new TypeError(`Expect 'at' to be in the range of 0 and length of array`);
        }
        if (!len)
            return [[], []];
        const atInt = Number(at);
        if (!atInt)
            return [[], ctx];
        if (atInt === len)
            return [ctx, []];
        return [ctx.slice(0, atInt), ctx.slice(atInt)];
    },
};
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