Data Structures and Algorithms with JavaScript: Bringing by Michael McMillan

By Michael McMillan

As an skilled JavaScript developer relocating to server-side programming, you want to enforce vintage facts buildings and algorithms linked to traditional object-oriented languages like C# and Java. This functional consultant exhibits you ways to paintings hands-on with various garage mechanisms—including associated lists, stacks, queues, and graphs—within the limitations of the JavaScript surroundings. ascertain which facts constructions and algorithms are most suitable for the issues you are attempting to resolve, and comprehend the tradeoffs while utilizing them in a JavaScript software.

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Creating Two-Dimensional Arrays A two-dimensional array is structured like a spreadsheet with rows and columns. To create a two-dimensional array in JavaScript, we have to create an array and then make each element of the array an array as well. At the very least, we need to know the number of rows we want the array to contain. With that information, we can create a twodimensional array with n rows and one column: var twod = []; var rows = 5; for (var i = 0; i < rows; ++i) { twod[i] = []; } The problem with this approach is that each element of the array is set to undefined.

We accomplish this by calling the join() func‐ tion with the empty string as the separator. The filter() function works similarly to every(), but instead of returning true if all the elements of an array satisfy a Boolean function, the function returns a new array consisting of those elements that satisfy the Boolean function. filter(passing); print("All grades: ); print(grades); print("Passing grades: "); print(passGrades); This program displays: All grades: 39,43,89,19,46,54,48,5,13,31,27,95,62,64,35,75,79,88,73,74 Passing grades: 89,95,62,64,75,79,88,73,74 Of course, we can also use filter() with strings.

ListSize; return true; } return false; } insert() uses the helper function find() to determine the correct insertion position for the new element by finding the element specified in the after argument. Once this position is found, we use shift() to insert the new element into the list. Then we increment listSize by 1 and return true to indicate the insertion was successful. pos = 0; } The clear() function uses the delete operator to delete the dataStore array, and the next line re-creates the empty array.

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