Given: a = [[1,2],[3,4],]
I want to do something like:
a = [for ([x,y] of a) [x*2,y]];
But this gives me the next error:
'SyntaxError: missing variable name'
I am able to do the following:
a = [for (z of a) [z[0]*2,z[1]]];
I prefer the first notation as the internal variables (x and y) can be given descriptive names making the code easier to read. Is it possible?
The array comprehensions is non-standard in Javascript. For future-facing usages, just use Array.prototype.map, Array.prototype.filter, arrow functions, and spread syntax features of Javascript language.
For this example, use map method which accepts as parameter a callback provided function.
let a = [[1,2],[3,4]];
console.log(a.map(([x,y]) => [x*2, y]));
b = a.map(([x,y]) => [x*2, y]) Thanks for your post. I'll avoid array comprehensions!
array comprehensionsis non-standard in Javascript. For future-facing usages, consider using Array.prototype.map, Array.prototype.filter, arrow functions, and spread syntax.