When working with TypeScript objects, is there a way to loop through a dictionary and set properties of another dictionary similar to how it is done in JavaScript?
for (let key in dict) {
if (obj.hasOwnProperty(key)) {
obj[key] = dict[key];
}
}
If obj is a TypeScript object (an instance of a class), is there a method to achieve the same operation?
Is there a way to perform the same operation if obj is an instance of a TypeScript object (class)?
Your JavaScript code can be used in TypeScript since it is valid (learn more). Here's an example:
class Foo{
foo = 123
}
const dict = new Foo();
const obj = {} as Foo;
for (let key in dict) {
if (obj.hasOwnProperty(key)) {
obj[key] = dict[key];
}
}
Please note that using Object.keys(obj).forEach(k=> is recommended even for JavaScript, but that is not the main focus of your question here.
Check out the newly introduced Object.hasOwn method.
For more details, refer to the ECMAScript 2022 language specification, 13th edition, released in June 2022
The fp-ts library's `has` function proved to be the most effective solution for my specific scenario:
const role = 'mother' as string
const rolesConst = {
mother: 'mother',
father: 'father'
} as const
if (has(role, rolesConst)) {
// role's type is 'mother' | 'father'
}
To achieve this, consider using the ECMAScript 6 feature Object.assign(obj, dict);.
If you are working with TypeScript, keep in mind that the spread operator is more suitable for creating new objects rather than overwriting properties within an existing class.
Remember, when using Object.assign, it only creates a shallow copy and may trigger any setters present in the target class.
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