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This article mainly introduces the relevant knowledge of "what is the difference between let and const in es6". The editor shows you the operation process through an actual case, the operation method is simple and fast, and it is practical. I hope this article "what is the difference between let and const in es6" can help you solve the problem.

The difference between let and const in es6 is that variables declared by let can be changed, values and types can be changed, while constants declared by const cannot be changed, that is, const must be initialized as soon as it is declared and cannot be assigned any more.

This tutorial operating environment: windows10 system, ECMAScript version 6. 0, Dell G3 computer.

The difference between let and const in es6

The differences between let and const:

Variables declared by let can be changed, values and types can be changed (let: variables are declared)

The constant declared by const cannot be changed.

This means that once the const is declared, it must be initialized immediately and cannot be assigned later

Const I; / / error, once declared, must immediately initialize const j = 5 * * j = 10; / / error, constant cannot be changed

What let and const have in common:

Both can only be declared valid within the block-level scope.

Use only after the variable is declared.

There is no variable promotion and there is a temporary dead zone.

Cannot have the same name as any other variable or function in its scope

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