check if list contains element js

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Lukas
01 Feb 2019
1var extensions = ["image/jpeg","image/png","image/gif"];          
2if(extensions.indexOf("myfiletype") === -1){
3	alert("Image must be .png, .jpg or .gif");
4}
source
Bilal
21 Jul 2018
1fruits.includes("Mango")   // Returns true
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