javascript check if variable exists
if (typeof myVar !== 'undefined') {
// myVar is defined
}javascript check if variable exists
if (typeof myVar !== 'undefined') {
// myVar is defined
}Checking whether a value exists in an array javascript
const fruits = ['apple', 'banana', 'mango', 'guava'];
function checkAvailability(arr, val) {
return arr.some(arrVal => val === arrVal);
}
checkAvailability(fruits, 'kela'); // false
checkAvailability(fruits, 'banana'); // trueCopyright © 2021 Codeinu
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