ruby challenges
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| # identity | |
| id = -> v { v } | |
| # composition | |
| composition = -> g, f { -> v { g[f[v]] } } | |
| # testing for id | |
| g = -> v { v * 2 } | |
| composition(g, id)[3] == g[3] # true | |
| composition(id, g)[3] == g[3] # true |
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