Answer by perona chan for How do I check if an array includes a value in JavaScript?

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const array = [1, 2, 3, 4, 2]console.log(   array.indexOf(2),          // 1   array.filter(e => e == 2), // [ 2, 2 ]   array.includes(2),         // true   array.find(e => e == 2)    // 2)// view does not matchconsole.log(   array.indexOf(12),          // -1   array.filter(e => e == 12), // []   array.includes(12),         // false   array.find(e => e == 12)    // undefined)// matchconsole.log(   array.indexOf(2) != -1,               // true   array.filter(e => e == 2).length > 0, // true   array.includes(2),                    // true   array.find(e => e == 2) != undefined  // true)