Answers for "check in array javascript"

77

javascript array contains

var colors = ["red", "blue", "green"];
var hasRed = colors.includes("red"); //true
var hasYellow = colors.includes("yellow"); //false
Posted by: Guest on October-19-2019
3

js check if array

Array.isArray([1, 2, 3]);	// true
Array.isArray('asdf');		// false
Posted by: Guest on July-19-2020
1

js test if array

if(Array.isArray(myVarToTest)) {
	// myVatToTest is an array
} else {
	// myVarToTest is not an array
}
Posted by: Guest on September-02-2020
4

javascript test if it is an array

// If you want to test if a variable (object) is an instance of 
// an array. You can use the Array.isArray(varName) method
// this method takes one argument, the variable or object you want to test
// and returns true, if the argument is an array 
// or false, if the argument is not an array

if (Array.isArray(object)) {
	// is true
} else {
	// is false
}

Array.isArray([1, 2, 3, 4]); // Returns true
Array.isArray(4); // returns false
// this could be used for flattening an array of arrays
Posted by: Guest on May-21-2020
1

not in array js

!array.includes("element")
Posted by: Guest on December-14-2020
3

javascript check if in array

var extensions = ["image/jpeg","image/png","image/gif"];          
if(extensions.indexOf("myfiletype") === -1){
	alert("Image must be .png, .jpg or .gif");
}
Posted by: Guest on January-13-2020

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