I have this array [ABC, QWE, XYZ] I would like to turn it into ['ABC', 'QWE', 'XYZ']
When I try to manipulate values in the current array I get: ReferenceError: ABC is not defined
Any ideas on how should I do it?
Thanks!
2 Answers
Convert arrays element types: Number to strings
var strArr = [1,2,3,4,5].map(String);
// Result: ["1","2","3","4","5"]
2 Comments
Jack_Hu
Why does this work?
Cornelius Dol
This is actually very brittle because String() while currently defines a single argument, it could be backward-compatibly enhanced to have others in future. Conversely, the map callback defines three arguments (elm,idx,arr); those additional arguments will almost certainly be misinterpreted if String(val) ever gains additional arguments. For example, maybe String(val) is enhanced to allow a byte array and charset,
String(bytes,"UTF-8". The moral is: never, ever use a function as a callback unless you control its signature.We can't do that directly but after little bit change you can do that... So the current array you said like array [ABC, QWE, XYZ],
Lets design you keys in object first:
var obj = {
ABC:1, QWE:'somevalue', XYZ:new Date()
}
So I created object obj having your variables lets say the three variables, now lets convert:
var arr = [];
for (var key in obj){
console.log(key, obj[key]);
arr.push(String(key));
}
console.log(arr);// you will see the desire result.
Running example here : example
'ABC'is a String. What isABC?