jsmodern/dist/array/truncate.js

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

export const truncate = {
    label: 'truncate',
    fn: function arrayTruncate(len) {
        const ctx = this;
        const length = ctx.length;
        if ('number' !== typeof (len) || len < 0 || len > length) {
            throw new TypeError(`Expect 'len' to be in the range of 0 and length of array`);
        }
        const lenInt = Number(len);
        if (!lenInt)
            ctx.length = 0;
        else if (lenInt < length) {
            const slice = ctx.slice(0, lenInt);
            ctx.length = 0;
            for (const n of slice)
                ctx.push(n);
        }
    },
};
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