Thinking in Ramda 7

Thinking in Ramda: Immutability and Arrays

Reading Array Elements

Ramda functions for reading array elements nth and slice and contains

const numbers = [10,20,30,40,50,60]
nth(3, numbers)  // => 40 (0-based indexing)
nth(-2, numbers) // =>50 (negative numbers start from the right)
slice(2, 5, numbers) // => [30,40, 50] (see below)
contains(20, numbers) // => true

nth(0) equals head, nth(-1) equals last.

It also provides functions for accesing all-but-the-first element tail,all-but-the-last element init,the first N elements take(N), and the last N elments takeLast(N).

Adding, Updating, and Removing Array Elements

• insert
• update
• append
• prepend
• update
• concat
• concatAfter = flip(concat)

Transforming Elements

• update
• adjust
• evolve

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