Generate all permutations and combinations of strings through JavaScript functions

Today I will introduce to you how to generate all permutations and combinations of strings through a JavaScript function. The so-called permutations and combinations are the most basic concepts in combinatorics.

First of all, let me give you a brief introduction to permutations and combinations:

1. Arrangement refers to sorting out a specified number of elements from a given number of elements.

2. Combination refers to taking out only a specified number of elements from a given number of elements, regardless of sorting.

The central problem of permutations and combinations is to study the total number of possible situations in permutations and combinations of specified requirements.

I believe everyone has some understanding of permutations and combinations.

Below we will use javascript code to calculate all permutations and combinations of strings.

The complete code is as follows:

Here we arrange and combine a sample string dog, and view the generated results as follows:

In the above code, we used several key methods, as follows:

1, pow() method: used to calculate y times of x Power, the syntax is "Math.pow(x,y)".

2, push()Method: You can add one or more elements to the end of the array and return the new length. The syntax is "array.push(item1, item2 , ..., itemX)".

3. join() method: used to put all the elements in the array into a string. The elements are separated by the specified delimiter. The syntax is " arrayObject.join(separator)".

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