JavaScript: binding to a variable

Asked Jun 19 '18 at 11:20

Active Jun 19 '18 at 11:27

Viewed 35 times

This may be a naive but i am not able to understand how javascript assign values to its variables. In this book, i came across the following code.

function greaterThan(n) {
return m => m > n;
}
let greaterThan10 = greaterThan(10);
console.log(greaterThan10(12));

How is m assigned the value 12 ? This does'nt give compile time as well as runtime error. Only if i remove m =>, i get an error that m is not defined.

edited Jun 19 '18 at 11:21

asked Jun 19 '18 at 11:20

Akhilesh

`**` is the exponentiation operator. That syntax looks a bit invalid – CertainPerformance Jun 19 '18 at 11:21
2

google `currying` in `js` https://medium.com/front-end-hacking/javascript-es6-curry-functions-with-practical-examples-6ba2ced003b1 – Muhammad Usman Jun 19 '18 at 11:22
removed it. I added it for bold style – Akhilesh Jun 19 '18 at 11:22
`return m => m > n` returns a function which takes a parameter `m` and returns whether `m` is greater than `n` (where `n` is a previously *closed over* value). So `greaterThan10` is such a function. – deceze Jun 19 '18 at 11:27
Understood. Thank you guys :) – Akhilesh Jun 19 '18 at 16:50

JavaScript: binding to a variable

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