1.1.0 • Published 9 years ago
guard-function v1.1.0
Guard-function
Guard a function using a predicate.
Installation
npm install guard-function
Usage
Basic usage
var guard = require('guard-function');
let capitalize = (str) => str.charAt(0).toUpperCase() + str.slice(1);
// Silently fail when non-string is passed in
capitalize = guard((str) => typeof str === 'string', capitalize);
capitalize(12); // => undefined
capitalize("you shall not pass!"); // => "You shall not pass!"
let div = (a, b) => a / b;
// Throw exception instead of failing silently by passing an Error instance as 3rd param
div = guard((a, b) => b !== 0, div, new Error('Divide by 0!');
div(8, 2); // => 4
div(8, 0); // => throws an Error