Function insert

Negative indices count backwards from the beginning of the string.

Remarks

Non-integer or out of bounds indices return the string unchanged. If the index equals the length of the string, then the string will be appended to the end.

Example

import * as S from "flurp/string";

const f = S.insert(2, "__");
const g = S.insert(6, "__");
const h = S.insert(-2, "__");
f("weasel");    // "we__asel"
g("weasel");    // "weasel__"
h("weasel");    // "weas__el"