This content originally appeared on CodeSource.io and was authored by Deven
In this article, you will learn How to Implement Block scope in JavaScript.
Block scope is a new ES6 feature. You create a new block scope for each set of curly braces. you use let and const keywords to add Variables to block scope.
Implement Block scope in JavaScript
Consider the example below:
function bScope() {
console.log('Scope at top');
let scopeExample = 8;
console.log(scopeExample);
{
console.log('Scope 2 value');
let scopeExample = 'scope 2 value 2 ';
console.log(scopeExample);
}
{
console.log('Scope 3');
let scopeExample = ' scope 3 value';
console.log(scopeExample);
}
}
bScope();To implement block scope in JavaScript with variables like above, follow the steps below:
- Create a function called
bScope. console.logthe string as ‘scope at top‘.- Create a variable called
scopeExamplewith the value of 8. console.logthe value of the variable calledscopeExample- Inside the function create a new Block Scope as shown above
- Inside the new Block scope , log the string called ‘scope 2 value’.
- Create a new variable called
scopeExample, inside that and assign the value ‘scope 2 value 2’ console.logthe value variable scope inside the block scope.- Outside of the block scope we created in step 5, create a new block scope
console.logthe string called ‘scope 3’.- Create a variable inside the scope block with the same name
scopeExampleand assign it the value the ‘scope 3 value‘. console.logthe new variable’s value.- Call
bScopeand test its output
The post How to Implement Block scope in JavaScript appeared first on CodeSource.io.
This content originally appeared on CodeSource.io and was authored by Deven
Deven | Sciencx (2021-02-24T15:59:53+00:00) How to Implement Block scope in JavaScript. Retrieved from https://www.scien.cx/2021/02/24/how-to-implement-block-scope-in-javascript/
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