javascript check if in array

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showing results for - "javascript check if in array"
Clara
21 Aug 2019
1var colors = ["red", "blue", "green"];
2var hasRed = colors.includes("red"); //true
3var hasYellow = colors.includes("yellow"); //false
Larissa
17 Jul 2018
1if(Array.isArray(myVarToTest)) {
2	// myVatToTest is an array
3} else {
4	// myVarToTest is not an array
5}
Anis
07 Mar 2019
1// If you want to test if a variable (object) is an instance of 
2// an array. You can use the Array.isArray(varName) method
3// this method takes one argument, the variable or object you want to test
4// and returns true, if the argument is an array 
5// or false, if the argument is not an array
6
7if (Array.isArray(object)) {
8	// is true
9} else {
10	// is false
11}
12
13Array.isArray([1, 2, 3, 4]); // Returns true
14Array.isArray(4); // returns false
15// this could be used for flattening an array of arrays
16
Claudia
22 Jul 2017
1var myList=["a", "b", "c"];
2mylist.includes("d")//returns true or false
Karim
30 Jan 2021
1
2var fruits = ["Banana", "Orange", "Apple", "Mango"];
3var n = fruits.includes("Mango");
4 
Gaëlle
07 May 2020
1var extensions = ["image/jpeg","image/png","image/gif"];          
2if(extensions.indexOf("myfiletype") === -1){
3	alert("Image must be .png, .jpg or .gif");
4} 
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