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TypeScript - String search - This method executes the search for a match between a regular expression and this String object. TypeScript - String indexOf - This method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex or -1 if the val. TypeScript - String charAt - charAt is a method that returns the character from the specified index. Characters in a string are indexed from left to right. The index of the first characte. 13/12/2019 · TypeScript - String substring - This method returns a subset of a String object.

Is there a way for TypeScript to statically check for an empty string? Is there a way to statically require a non-empty string to be passed to a function? let fn = functiona:string ; fn''. It’s now possible, I just released an enhanced version of the TypeScript compiler that provides full reflection capabilities. You can instantiate classes from their metadata objects, retrieve metadata from class constructors and inspect interface/classes at runtime. You can also use template strings, which can span multiple lines and have embedded expressions. These strings are surrounded by the backtick/backquote ` character, and embedded expressions are of the form $ expr . let fullName: string = `Bob Bobbington`; let age: number = 37; let sentence: string = `Hello, my name is $ fullName .

If a function takes a DOM element as a parameter, it can be a string, or a jQuery object, for example. Or why not both? With a small conditional check it’s possible. Take the following example, where the function simply gets element’s dimensions and returns and object. My beloved TypeScript 1.4 we got a while back came with a new lovely possibility of having parameters passed as object that might be of several different types. For example you can accept either string or array of strings, where if passed a plain string, you can split it and continue with array of strings or use directly passed array. TypeScript 2.0 Null- and undefined-aware typesTypeScript has two special types, Null and Undefined, that have the values null and undefined respectively. Previously it was not possible to explicitly name these types, but null and undefined may now.

String Literal Types in TypeScript March 31, 2016. With TypeScript 1.8, string literal types made their way into the language. The pull request in which they're implemented summarizes them as follows: A string literal type is a type whose expected value is a string with textual contents equal to that of the string literal type.

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