JavaScript Getting Started With ES2015 Defining Variables With let and const Using let with for Loops

Posted by John Cannon
John Cannon
Full Stack JavaScript Techdegree Student 3,161 Points

Before ES6

Ok I understand why we should use let instead of var in a for loop. But before ES6 how did programmers solved the issue of var in a for loop since there was no let

Thanks

2 Answers

Steven Parker
Steven Parker
203,717 Points
Steven Parker
Steven Parker
203,717 Points

The classic technique was to use an immediately invoked anonymous function to create what is known as a "closure". That gave the variable created with "var" a unique and persistent scope similar to what you get with "let".

John Cannon
John Cannon
Full Stack JavaScript Techdegree Student 3,161 Points

Can you give me an example

John Cannon
John Cannon
Full Stack JavaScript Techdegree Student 3,161 Points
John Cannon
John Cannon
Full Stack JavaScript Techdegree Student 3,161 Points

Thanks