jsmodern/dist/string/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 stringInsert(index, s) {
        const ctx = this;
        const len = ctx.length;
        if (index < 0 || index > len)
            throw new TypeError('String index out of bound');
        if (!len)
            return s;
        if (index === len)
            return `${ctx}${s}`;
        if (!index)
            return `${s}${ctx}`;
        const slice0 = ctx.slice(0, index);
        const sliceRest = ctx.slice(index);
        return `${slice0}${s}${sliceRest}`;
    },
};
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