jsmodern/dist/array/insert.js

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

export const insert = {
    label: 'insert',
    fn: function arrayInsert(index, element) {
        const ctx = this;
        const len = ctx.length;
        if (null == index || 'number' !== typeof (index) || index < 0 || index > len) {
            throw new TypeError(`Array index out of bound`);
        }
        if (!index) {
            ctx.unshift(element);
        }
        else if (index === len) {
            ctx.push(element);
        }
        else {
            const startSlice = ctx.slice(0, index);
            const endSlice = ctx.slice(index);
            ctx.length = 0;
            for (const n of startSlice.concat(element, endSlice))
                ctx.push(n);
        }
    },
};
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