How can i achieve following javascript code in typescript.
var childs = [];
childs[34] = [12,23,54,65];
childs[122] = [43,56,23,31];
childs[212343] = [345,643,24,745];
console.log(childs);
Add a comment
|
1 Answer
Your code is already a valid typescript code as typescript is a superset of javascript.
However, typescript lets you have types, so in this case you can do this:
var childs: number[][] = [];
childs[34] = [12,23,54,65];
childs[122] = [43,56,23,31];
childs[212343] = [345,643,24,745];
console.log(childs);
Notice that the only thing I added was the type of childs (number[][]), which can also be written like:
var childs: Array<number[]> = [];
// or
var childs: Array<Array<number>> = [];
You'll get a compiler error if you try to add anything else to the array:
childs.push(4); // error: Argument of type '4' is not assignable to parameter of type 'number[]'
childs.push([2, "4"]); // error: Argument of type '(string | number)[]' is not assignable to parameter of type 'number[]'
3 Comments
Ruman Khan Pathan
sir compiler is giving an error "Duplicatie identifiers 'childs'" & "subsequent variable must have same type.variable childs must be of type number[][], but here has type '[number , number ,number]'" What should i do for this???
Nitzan Tomer
What is the code that results in those errors? (edit your question and add it there)
Ruman Khan Pathan
Thank u Sir , Code is now working . I havent initialized variables inside class constructor. I was initializing variables outside of constructor & was not using this keyword. Thank u