const army=["Marcos", "DeltaForce", "Seals", "SWAT", "HeadHunters"]; if(army.indexOf("DeltaForce") !== -1) { console.log("exist") } else { console.log("not exist") } if(army.includes("DeltaForce")) { console.log("exist") } else { console.log("not exist") } for(let i = 0; i < army.length; i++) { if(army[i] === "DeltaForce") { console.log("exist") break } }
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