3.3.6 • Published 5 years ago
lives v3.3.6
lives
A variable lives here
Save yourself from messy & unreliable nested object checking.
- Tiny w/ zero dependencies (500B minified)
- 100% test coverage
- Works in Node.js and legacy browser environments
- Includes useful helper functions for different use cases
npm i --save lives
Usage
Lives(attempt)
const lives = require('lives');
const hello = {
a: {
b: {
c: 'Hello'
}
}
};
const missing = {
a: null
};
if (lives(() => hello.a.b.c)) {
console.log(hello.a.b.c, 'World!'); // Hello World!
}
Lives.key(target, key)
if (lives.key(hello, 'a.b.c')) {
console.log(hello.a.b.c, 'World!'); // Hello World!
}
Lives.not(attempt)
if (lives.not(() => missing.a.b.c)) {
throw new Error('Variable is missing!');
}
Lives.get(attempt)
console.log(lives.get(() => hello.a.b.c), 'World!'); // Hello World!
lives.get(() => missing.a.b.c); // undefined
Lives.or(attempt, fallback)
console.log(lives.or(() => missing.a.b.c, 'Hello'), 'World!'); // Hello World!
Lives.is(attempt, type)
lives.is(() => hello.a.b.c, 'string'); // True
lives.is(() => hello.a.b.c, 'boolean'); // False
lives.is(() => missing.a.b.c, 'string'); // False
lives.is(() => missing.a.b.c, 'undefined'); // True
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