Published Jun 10 2020
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 itβs also very useful when you donβt 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)
}
I wrote an entire book on this topic π
I also got a super cool course π
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