Javascript 는 경우 문자열 incluees 배열

코드 예제

3
0

javascript 확인하는 경우에는 배열

var extensions = ["image/jpeg","image/png","image/gif"];          
if(extensions.indexOf("myfiletype") === -1){
	alert("Image must be .png, .jpg or .gif");
} 
1
0

js 확인하는 경우 문자열이 포함되어 있에서 배열

const found = arrayOfStrings.find(v => str.includes(v));

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