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Check if three consecutive elements in an array is identical in JavaScript
We are required to write a JavaScript function, say checkThree() that takes in an array and returns true if anywhere in the array there exists three consecutive elements that are identical (i.e., have the same value) otherwise it returns false.
Therefore, let’s write the code for this function −
Example
const arr = ["g", "z", "z", "v" ,"b", "b", "b"];
const checkThree = arr => {
const prev = {
element: null,
count: 0
};
for(let i = 0; i < arr.length; i++){
const { count, element } = prev;
if(count === 2 && element === arr[i]){
return true;
};
prev.count = element === arr[i] ? count + 1 : count;
prev.element = arr[i];
};
return false;
};
console.log(checkThree(arr));
console.log(checkThree(["z", "g", "z", "z"]));Output
The output in the console will be −
true false
Updated on: 26-Aug-2020
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