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If you want only a certain value of the parameter that can be used inside your TypeScript function then you can use the literal type to do so as shown in the following lines of code. The TypeScript program above will generate the following error during compilation because 6 is not the permitted parameter inside…
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Below TypeScript example will show you how to override a function. In order to override a function you will need to provide a function with its parameter of type any and its return value also of type any. However, this does not mean that any type of parameter or the return value will be permitted…
In this typescript example, I am going to create a callback function that will return a string depending on the text the user has entered into the second parameter of the calling function. First of all, let us create the callback function as follows:- As you can see above that the call-back function will receive…
Yes, it is right, you do not need to specify any parameter in the TypeScript function, all you need is to use the rest syntax together with the array variable type assigned to that argument as follows:- The rest syntax is the one with three dots in front of the array argument with the number…
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In the below function, I have assigned a default value to the second parameter of that function that will be used if no value has been assigned as the second parameter of that function. First let us run the above function with all values as follows:- Next let us leave out the second parameter as…
Below is the method to create a Tuple in TypeScript. As you can see, before assigning elements in the above tuple you will need to declare the type of each element first within the [] bracket. Accessing the element in that tuple is just like accessing the element in an array with index 0 as…
If you want to copy the properties of an object to another object in TypeScript you can use the object spread technique as follows:- Suppose you create an object as follows:- Later you want to copy those object’s properties to another object then you can use the object spread technique as follows:- This second object…
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In the below program, the function will return a string indicating that that object is not a number using TypeScript nullish coalescing which will provide a default value for that variable if it is either null or undefined. The ?? is nullish coalescing operator which will provide the default value on the left hand side…
In the previous article, I created an object whose properties will get summed up within the below function and the outcome will get returned and printed out on the console. What will happen if I have entered an undefined object into that function instead of the object itself as follows?:- Well, this is what you…
In this example, I am going to create an object in TypeScript and then add up the two properties within that object. First of all, let us create the object in TypeScript. The above object belongs to the loose type with two property values. Next, let us create the function to add up the two…
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