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

Popularity 10/10 Helpfulness 3/10 Language javascript

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Tags: javascript j

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Contributed on Jan 13 2020

Friendly Hawk

0 Answers Avg Quality 2/10

how to check if an element is in array javascript

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array.includes('element that need to be checked') //returns true or false

Popularity 10/10 Helpfulness 2/10 Language javascript

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Tags: element

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Contributed on Oct 14 2022

Ashwin Joshy

0 Answers Avg Quality 2/10

check items in array javascript

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function checkAllEven(arr) {
  return arr.every(function(x){
	 return	x % 2 === 0
	})
}

//using "every" to check every item in array.

Popularity 10/10 Helpfulness 1/10 Language javascript

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Tags: items item

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Contributed on Feb 23 2020

Panicky Polecat

0 Answers Avg Quality 2/10

not in array js

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