Learn English together | three ways to realize digital factorial with JavaScript

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Original title: “Three Ways to Factorialize a Number in JavaScript”
Sonya Moisset
The original link: https://medium.freecodecamp.com/how-to-factorialize-a-number-in-javascript-9263c89a4b38
2. The English version of the dictionary is translated by the English version of the dictionary
Front-end technology changes with each new day, a lot of new technical articles are in English, which requires us to have a good English ability, from today on small make up and we learn English while learning the front end, due to limited ability, welcome everyone correct, together to improve English.
This article is based on Free Code Camp Basic Algorithm Scripting “Factorialize a Number”.
Translation:
This article is based on the Free Code Camp basic algorithm script “Digital factorials”.
Note: Free Code Camp is a Free online learning website. Web site address: https://www.freecodecamp.com
Key words:
algorithm
An algorithm, esp in a computer program
In mathematics, the factorial of a non-negative integer n can be a tricky algorithm. In this article, I’m going to explain three approaches, first with the recursive function, second using a while loop and third using a for loop.
Translation:
In mathematics, factorial of a non-negative integer n can be a tricky algorithm. In this article, I’ll do it three ways, first with recursive functions, second with a while loop, and third with a for loop.
Key words:
factorial
It is a factor of two
N. The factorial product
non-negative
non-negative
tricky
Difficult to deal with; Difficult to deal with; Tricky; Crafty; scheming. The treacherous; Sly.
approach
vt.& Come near, come near, come near
Vt. Close to; Get to grips with; Make closer; Try to bribe (or influence, smooth)
N. method; Way; Close to the
Vi. Near
recursive function
Recursive function
We have already seen a recursion approach on a String in the previous article, How to Reverse a String in JavaScript in 3 Different Ways ?This time we will apply the same concept on a number.
Translation:
We’ve seen recursion in string manipulation in the last article. How do you reverse strings in JavaScript in three different ways?This time we’ll apply the same concepts to Numbers.
Key words:
concept
Concept; Point of view; Thought, conception, idea; The overall impression

Algorithm Challenge

Return the factorial of the provided integer.

If the integer is represented with the letter n, a factorial is the product of all positive integers less than or equal to n.

So, flexibly?B: Well, general rules are often terrible.

For example: 5! So it’s 1 times 2 times 3 times 4 times 5, which is 120
Translation:
Challenge algorithm
Returns the factorial of a specified integer.
If integers are represented by the letter N, the factorial is the product of all positive integers less than or equal to N.
Factorial is usually written in shorthand notation N! Said.
For example: 5! So it’s 1 times 2 times 3 times 4 times 5, which is 120
The function factorialize (num) {
return num;    
}
factorialize(5);    
Key words:
represented
V. representative; Reflect; To represent (a past tense and past participle); As a… The representative of the
positive
adj.
Positive; Be sure of STH. Positive; Positive
n.
Positive; Positive; [Language] a primal adjective; Positive quantity
shorthand notation
Simplify the symbol
Provided the test cases
Factorialize (0) should return 1factorialize(5) should return 120factorialize(10) should return 3628800factorialize(20) should return 2432902008176640000
Translation:
Provide test cases:
Factorialize (0) should return 1factorialize(5) should return 120factorialize(10) should return 3628800factorialize(20) should return 2432902008176640000
Key words:
provided
Conj. If; If; In the… Under the condition of
A. provide B. provide C. provide D. provide
What is factorializing a number all about?

When you factorialize a number, you are multiplying that number by each consecutive number minus one.

If your number is 5, you would have:
5! = 5 * 4 * 3 * 2 * 1
The pattern would be:
0! = 1
1! = 1
2! = 2 * 1
3! = 3 * 2 * 1
4! = 4 * 3 * 2 * 1
5! So it’s 5 times 4 times 3 times 2 times 1
Translation:
What exactly is a digital factorial?
When you take the factorial of a number, decrease the number by 1 each time and multiply.
If the number is 5, you should look like this:
5! So it’s 5 times 4 times 3 times 2 times 1
This pattern will:
0! = 1
1! = 1
2! = 2 * 1
3! = 3 * 2 * 1
4! = 4 * 3 * 2 * 1
5! So it’s 5 times 4 times 3 times 2 times 1
Key words:
consecutive
Continuous, continuous, or continuous; Indicating the result
multiplying
Six (multiply) four times from six. Multiply; multiply. Add to; add to Breed
1. Factorialize a Number With Recursion
The function factorialize (num) {
if (num < 0)
return -1;    
Else if (num == 0)
return 1;    
The else {
return (num * factorialize(num – 1));    
}
}
factorialize(5);    
2 Factorialize a Number with a WHILE loop
The function factorialize (num) {
var result = num;    
If (num === 0 || num === 1)
return 1;    
while (num > 1) {
num–;    
result *= num;    
}
return result;    
}
factorialize(5);    
3 Factorialize a Number with a FOR loop
The function factorialize (num) {
If (num === 0 || num === 1)
return 1;    
for (var i = num – 1; i > = 1; I -) {
num *= i;    
}
return num;    
}
factorialize(5);    

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