README.md

swape-has

Check if sub branch of an object exists. A cleaner code for checking sub sub sub sub object values.

This makes the code cleaner to check for very deep objects.

If you can use Optional Chaining you should use that instead. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining

install in node.js

npm install swape-has

// require the code like this
const has = require('swape-has');
// or
import has from 'swape-has'

usage in node.js

import has from 'swape-has'

const testObj = {
    level1: {
        level2: {
            levelA: {
                levelB: {
                    levelC: {
                        levelD: {
                            life: 42
                        }
                    }
                }
            }
        }
    }
};

// check if we have this value
if (has(testObj, 'level1.level2.levelA.levelB.levelC.levelD.life') && testObj.level1.level2.levelA.levelB.levelC.levelD.life === 42) {
    console.info('Passed 1');
} else {
    console.warn('Failed 1');
}

// check if we don't have this value
if (!has(testObj, 'level1.level2.levelA.levelB.levelX')) {
    console.info('Passed 2');
} else {
    console.warn('Failed 2');
}

// has with value test (3rd option)
if (has(testObj, 'level1.level2.levelA.levelB.levelC.levelD.life', 42)) {
    console.info('Passed 3');
} else {
    console.warn('Failed 3');
}

if (has(testObj, 'level1.level2.levelA.levelB.levelC.levelD.life', 43)) {
    console.info('Failed 4');
} else {
    console.warn('Passed 4');
}

This would be written like this if we didn't use "has" function:

  if (testObj
    && testObj.level1
    && testObj.level1.level2
    && testObj.level1.level2.levelA
    && testObj.level1.level2.levelA.levelB
    && testObj.level1.level2.levelA.levelB.levelC
    && testObj.level1.level2.levelA.levelB.levelC.levelD
    && testObj.level1.level2.levelA.levelB.levelC.levelD.life
    && testObj.level1.level2.levelA.levelB.levelC.levelD.life === 42
) {
    // do something
}