Description

The guard function helps to verify an input parameters and result of your functions. You can use it as follow

   const fun = guard(guards, fn);

where:

• guards is a list of validator functions, e.g. [g1, g2, gR] where g1 is function (guard) for variable x1, function g2 for x2 and gR is guard for result of fn,
• fn is your function.

Usage

> import * as G from './guards';

> const tenDividedBy = G.guard([G.notZero, G.isLess(4)], (x) => 10 / x);
> tenDividedBy(2) // 5
> tenDividedBy(0) // Error: The value is zero!
> tenDividedBy(5) // Error: The value is less than 4!


> const add = G.guard([G.notZero, G.isLess(1), G.isGreater(3)], (x, y) => x + y);
> add(2, 0) // ... try it yourselves

Test

• all files

npm run test

• single file, e.g. guards.test.js

npm test -t Guard

Dependencies

"devDependencies": {
    "check-types": "^11.1.2",
    "fast-check": "^1.23.0",
    "jest": "25.1.0",
    "ramda": "^0.27.0"
}