JavaScript generates simple arithmetic differential series and javascript arithmetic differential Series

JavaScript generates simple arithmetic differential series and javascript arithmetic differential Series

The question is very simple. The simplest way is to use the for loop.

let arr = []for (let i = 0; i < b - a + 1; i++) { arr.push(i + a)}return arr

Advanced

When I think about it later, I feel that the previous method is a bit stupid. Then I come up with these methods again.

Array vacancy

Join () and toString () will regard the blank space as undefined (string form ):

// Splice> split> mapArray (B-a + 1 ). join (''). split (''). map (e, I) => a + I) // convert string> split> mapArray (B-a + 1 ). toString (). split (','). map (e, I) => a + I)

Use the Array. from method to implement:

// Convert an empty Array to an Array. from (Array (B-a + 1 )). map (e, I) => a + I) // convert objects similar to arrays. from ({length: B-a + 1 }). map (e, I) => a + I) Array. from ({length: B-a + 1}, (e, I) => a + I)

The extension operators of ES6 can help us complete this task more conveniently.

[... Array (B-a + 1)]. the map (e, I) => a + I) fill (), entries (), and keys () methods do not ignore the empty Array (B-a + 1 ). fill (''). map (e, I) => a + I )[... array (B-a + 1 ). entries ()]. map (e => e [0] + )[... array (B-a + 1 ). keys ()]. map (e => e +)

There are other ways to do this, such as findIndex (), find (),...

Summary

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