It's simple using ES6 Javascript.
TIPS: you can use Babel (or use babel-loader with Webpack) for cross-browser support.
['apple', 'orange', 'banana'].includes('banana')Using indexOf, but it doesn't work with IE8.
if (['apple', 'orange', 'banana'].indexOf(value) >= 0) { // found}To support IE8 as well, you could implement Mozilla's indexOf polyfill.
if (!Array.prototype.indexOf) { // copy Mozilla's indexOf polyfill code here}You can also use jQuery inArray.
jQuery.inArray(value, ['apple', 'orange', 'banana')If you are using underscore or lodash.
_.indexOf['apple', 'orange', 'banana'], value)