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The const Keyword - Variables & Data Types | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

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The const Keyword

Constant values

Use const for values that shouldn't change:

const PI = 3.14159
const MAX_USERS = 100
const APP_NAME = "MyApp"

Trying to reassign a const throws an error:

const x = 5
x = 10  // TypeError: Assignment to constant

Use const by default. Only switch to let when you know the value needs to change. This makes your code safer and your intentions clearer.