Check if all values of array are equal

by 
const allEqual = arr => arr.every( v => v === arr[0] )
allEqual( [1,1,1,1] )  // true

Or one-liner:

[1,1,1,1].every( (val, i, arr) => val === arr[0] )   // true

Array.prototype.every (from MDN) :
The every() method tests whether all elements in the array pass the test implemented by the provided function.

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