Apoorv Tyagi const value = 1; const start = performance.now(); for(let i = 0; i<100000; i++) { if ([1, 'one', 2, 'two'].includes(value)) { } } console.log(performance.now() - start); const start2 = performance.now(); for(let i = 0; i<100000; i++) { if (value === 1 || value === 'one' || value === 2 || value === 'two') { } } console.log(performance.now() - start2); Second is 2 times faster

Apoorv Tyagi make a loop of 1000 and compare durations

if ([1, 'one', 2, 'two'].includes(value)) { } It creates new array every time. It is slower than multiple values comparison