str/slice

Extract a substring by start and optional end index

const app = mvfm(prelude);
const prog = app({ s: "string" }, ($) => {
  return $.slice($.input.s, 0, 5);
});
await fold(defaults(app), injectInput(prog, { s: "hello world" }));

const app = mvfm(prelude);
const prog = app({ s: "string" }, ($) => {
  return $.slice($.input.s, 0, 5);
});
await fold(defaults(app), injectInput(prog, { s: "hello world" }));

const app = mvfm(prelude);
const prog = app({ s: "string" }, ($) => {
  return $.slice($.input.s, 0, 5);
});
await fold(defaults(app), injectInput(prog, { s: "hello world" }));

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