If obj is a TypeScript object (instance of a class), is there a way to perform the same operation? Your JavaScript is valid TypeScript (more). So you can use the same code as it is. Here is an example: class Foo{ foo = 123 } const dict = new Foo(); const obj = {} as … Read more
Remember that the Python int type does not have a limited range like C int has; the only limit is the available memory. Memory goes to storing the value, the current size of the integer storage (the storage size is variable to support arbitrary sizes), and the standard Python object bookkeeping (a reference to the … Read more
You can’t modify this.props. Here tempProps is reference of this.props so it does not work. You should create a copy of the props using JSON.parse() and JSON.stringify() var tempProps = JSON.parse(JSON.stringify(this.props)); tempProps.legendPosition = ‘right’; Object.preventExtensions(tempProps); console.log(tempProps); For a better and efficient way to deep clone object see What is the most efficient way to deep … Read more
To the best of my knowledge, .groups() returns a tuple of remembered groups. I.e. those groups in the regular expression that are enclosed in parentheses. So if you were to write: print re.search(r'(1)’, ‘1’).groups() you would get (‘1’,) as your response. In general, .groups() will return a tuple of all the groups of objects in … Read more
From: http://ejohn.org/blog/ecmascript-5-objects-and-properties/ Writable: If false, the value of the property can not be changed. Configurable: If false, any attempts to delete the property or change its attributes (Writable, Configurable, or Enumerable) will fail. Enumerable: If true, the property will be iterated over when a user does for (var prop in obj){} (or similar).
You can use the ? to make the keys optional, so interface Partial { a?: boolean; b?: boolean; c?: boolean; } Or, you can do this: type Keys = “a” | “b” | “c”; type Test = { [K in Keys]?: boolean }
For v0.7+ Use fieldnames(x), where x is a DataType. For example, use fieldnames(Date), instead of fieldnames(today()), or else use fieldnames(typeof(today())). This returns Vector{Symbol} listing the field names in order. If a field name is myfield, then to retrieve the values in that field use either getfield(x, :myfield), or the shortcut syntax x.myfield. Another useful and … Read more
JavaScript is a prototype-oriented language. It can build actual objects from a constructor function and it has almost any feature that any object could have: Constructor. Methods (i.e. functions in JavaScript). Properties (since ECMA-Script 5, “getters/setters”). Instances. In JavaScript, any object has a prototype, including functions. The prototype itself is a rudimentary way of adding … Read more
Short answer: use unary array operator ,: ,$theArray | foreach{Write-Host $_} Long answer: there is one thing you should understand about @() operator: it always interpret its content as statement, even if content is just an expression. Consider this code: $a=”A”,’B’,’C’ $b=@($a;) $c=@($b;) I add explicit end of statement mark ; here, although PowerShell allows … Read more