Say you have this object:
const dog = {
name: 'Roger'
}
To get the value of the name property, you can use the dot syntax, like this:
dog.name
Or you can use the square brackets property accessor syntax:
dog['name']
This is especially useful when a property has not a valid variable name, like the name:
const dog = {
'the name': 'Roger'
}
dog['the name']
and it’s also very useful when you don’t know the property name beforehand, and you evaluate it programmatically, like in this example that loops through the object property names:
const dog = {
'the name': 'Roger'
}
for (const [key, value] of Object.entries(dog)) {
console.log(value)
}
Download my free JavaScript Beginner's Handbook, and check out my premium React/Vue/Svelte/Node/Next.js courses!
Coming soon:
