In Python3.8 There is new operator called walrus
which can assign new variables inside a condition. Is there something similar to it in Node.Js ?
my_var = 5
if (result := my_var == 5):
print(result)
There's no need for a separate operator, assignment is already an expression in Javascript:
"use strict";
var my_var = 5;
var result;
if (result = my_var == 5){
console.log(result)
}
Assign and compare as one expression. To make it work in strict mode and avoid linter complaints, add parentheses to the assignment.
const my_var = 5;
let result;
if ((result = my_var) === 5) {
console.log(result);
}
You can do it like this:
const myNumber = 2;
let newNumber;
if (newNumber = myNumber === 2) {
console.log('this works!');
}
It's kind of the same, it has an assignment and a comparison in the same line. You can obviously substitute your problem with this:
const my_var = 5;
let result;
if(result = my_var === 5) {
console.log(result);
}
As you can see it's obligatory to have a let declaration before-hand.
This can't work unless you're not using strict mode. It's to prevent mistakes.
You can see this part of the document on MDN for more info
You can do what @juanpa.arrivillaga mentioned if you don't use strict mode, which I strongly advise again. Strict mode will save you 100x more headache than it will make you.
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