diff options
Diffstat (limited to 'typescript.html.markdown')
| -rw-r--r-- | typescript.html.markdown | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/typescript.html.markdown b/typescript.html.markdown index 6feaca45..55d8cefe 100644 --- a/typescript.html.markdown +++ b/typescript.html.markdown @@ -203,8 +203,8 @@ p1.age = 25; // Error, p1.x is read-only var p2 = { name: "John", age: 60 }; var p3: Person = p2; // Ok, read-only alias for p2 -p3.x = 35; // Error, p3.x is read-only -p2.x = 45; // Ok, but also changes p3.x because of aliasing +p3.age = 35; // Error, p3.age is read-only +p2.age = 45; // Ok, but also changes p3.age because of aliasing class Car { readonly make: string; @@ -223,6 +223,30 @@ moreNumbers[5] = 5; // Error, elements are read-only moreNumbers.push(5); // Error, no push method (because it mutates array) moreNumbers.length = 3; // Error, length is read-only numbers = moreNumbers; // Error, mutating methods are missing + +// Iterators and Generators + +// for..of statement +// iterate over the list of values on the object being iterated +let arrayOfAnyType = [1, "string", false]; +for (const val of arrayOfAnyType) { + console.log(val); // 1, "string", false +} + +let list = [4, 5, 6]; +for (const i of list) { + console.log(i); // "4", "5", "6" +} + +// for..in statement +// iterate over the list of keys on the object being iterated +for (const i in list) { + console.log(i); // "0", "1", "2", +} + + + + ``` ## Further Reading |