arrays - Read For Learn

How to remove all duplicates from an array of objects?

How about with some es6 magic? Reference URL A more generic solution would be: Using the above property strategy instead of JSON.stringify: You can add a wrapper if you want the propNames property to be either an array or a value: allowing both getUniqueItemsByProperties(‘a’) and getUniqueItemsByProperties([‘a’]); Stackblitz Example Explanation Start by understanding the two methods used: filter, findIndex Next take your idea of what … Read more

Checking to see if array is full

Since you are using array, the size of array is determined during compilation. Thus if your intention is to check whether current array’s index has reached the last array element, you may use the following condtion (possibly in a loop) to check whether your current array index is the last element. If it is true, … Read more

Excess elements of scalar initializer for pointer to array of ints

The two are only partly equivalent. The difference being that: declares a two-dimensional array, which includes setting aside space for the array and ensuring that daytab references that memory. However: …only declares a pointer. So you’re trying to initialize a pointer with an array initializer, which doesn’t work as expected. There is no array; there’s no memory … Read more

Numpy – add row to array

What is X? If it is a 2D-array, how can you then compare its row to a number: i < 3? EDIT after OP’s comment: add to A all rows from X where the first element < 3:

C++ pass an array by reference

Arrays can only be passed by reference, actually: This prevents you from doing things like: To be able to pass an arbitrary size array to foo, make it a template and capture the size of the array at compile time: You should seriously consider using std::vector, or if you have a compiler that supports c++11, std::array.

Get only part of an Array in Java?

The length of an array in Java is immutable. So, you need to copy the desired part into a new array.Use copyOfRange method from java.util.Arrays class: startIndex is the initial index of the range to be copied, inclusive.endIndex is the final index of the range to be copied, exclusive. (This index may lie outside the array) E.g.:

How to add a string to a string[] array? There’s no .Add function

You can’t add items to an array, since it has fixed length. What you’re looking for is a List<string>, which can later be turned to an array using list.ToArray(), e.g.

Can I create an Array of Char pointers in C?

It looks like you’re confused by the double stars in The double stars just means that this function expects you to pass a pointer to a pointer to a char. This syntax doesn’t include any information about the fact that you are using an array, or that the char is actually the first char of many … Read more

Getting the array length of a 2D array in Java

Consider Column lengths differ per row. If you’re backing some data by a fixed size 2D array, then provide getters to the fixed values in a wrapper class.

Any way to declare an array in-line?

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