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added 53 characters in body

edited Nov 1, 2016 at 22:00

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JavaScript (ES6), 8484 81 bytes

s=>(new Set(st=[...s]).size>2)*(![...s]t.some((c,i)=>c>s[i+1])-![...s]t.some((c,i)=>c<s[i+1]))

Assumes the input is all in the same case. Returns 1 for raising wavy, -1 for decreasing wavy, 0 or -0 (both are falsy) for not wavy. Edit: Saved 3 bytes thanks to @RobertHickman.

JavaScript (ES6), 84 bytes

s=>(new Set(s).size>2)*(![...s].some((c,i)=>c>s[i+1])-![...s].some((c,i)=>c<s[i+1]))

Assumes the input is all in the same case. Returns 1 for raising wavy, -1 for decreasing wavy, 0 or -0 (both are falsy) for not wavy.

JavaScript (ES6), 84 81 bytes

s=>(new Set(t=[...s]).size>2)*(!t.some((c,i)=>c>s[i+1])-!t.some((c,i)=>c<s[i+1]))

Assumes the input is all in the same case. Returns 1 for raising wavy, -1 for decreasing wavy, 0 or -0 (both are falsy) for not wavy. Edit: Saved 3 bytes thanks to @RobertHickman.

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answered Oct 28, 2016 at 20:51

Neil

184.4k
12
76
290

JavaScript (ES6), 84 bytes

s=>(new Set(s).size>2)*(![...s].some((c,i)=>c>s[i+1])-![...s].some((c,i)=>c<s[i+1]))

Assumes the input is all in the same case. Returns 1 for raising wavy, -1 for decreasing wavy, 0 or -0 (both are falsy) for not wavy.