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ArithGeo created by wwebby1 - https://repl.it/E5tx/2
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//check if a sequence follows an arithmetic or geometric pattern. return -1 if neither | |
function ArithGeo(arr) { | |
var arithchecker = false; | |
var geochecker = false; | |
for(var i = 1; i < arr.length; i++) | |
{ | |
var diff1 = arr[i] - arr[i-1]; | |
var diff2 = arr[i+1] - arr[i]; | |
if(diff1 == diff2) | |
arithchecker = true; | |
else | |
arithchecker = false; | |
break; | |
} | |
for(var j = 1; j < arr.length; j++){ | |
var dif1 = arr[j] - arr[j-1]; | |
var dif2 = arr[j+1] - arr[j] | |
var dif3 = arr[j+2] - arr[j+1]; | |
var ratio1 = dif2/dif1; | |
var ratio2 = dif3/dif2; | |
if(ratio1 == ratio2) | |
geochecker = true; | |
else | |
geochecker = false; | |
break; | |
} | |
if(arithchecker===true) | |
console.log("Arithmetic"); | |
else if(geochecker===true) | |
console.log("Geometric"); | |
else | |
console.log(-1); | |
} | |
// keep this function call here | |
ArithGeo([1, 2, 3, 4] ) ; | |
ArithGeo([2, 4, 8, 16]); | |
ArithGeo([1, 3, 6, 9]); |
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