JavaScript – Check if String contains a substring
In JavaScript, we can use the classic indexOf()
or the new ES6 includes
to check if a String contains a substring.
// old school, classic way
var str = "mkyong";
if (str.indexOf('yo') > -1) { // returns `-1` if it is not present.
console.log('match') // display this
} else {
console.log('not found')
}
// ES6 only
var str = "mkyong";
console.log(str.includes('mk')); //true
console.log(str.includes('mkg'));//false
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