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kieraneglin/safe-access-object.js

Last active February 28, 2019 13:01
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Safely Access Deeply Nested Objects In JavaScript
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safe-access-object.js
// Problem: how do you access a deeply nested object that you're not certain exists?
// if(object.user && object.user.post && object.user.post[0] && object.user.post[0].comment) {
// return object.user.post[0].comment
// }
// and that's horrifying. Here's something better
const idx = (props, object) => props.reduce((prefix, val) => (prefix && prefix[val]) ? prefix[val] : null, object)
// Usage:
nestedObj = {...}
idx(['object', 'user', 'post', 0, 'comment'], nestedObj) // Returns associated value or null
@manusisnova
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Work great thanks!!

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