How to check if a string contains a string in JavaScript?
You might be surprised to learn just how easy it is to use the String. contains() method in a JavaScript program. The function takes a single string parameter and returns true or false depending on whether the value can be found within the first parameter. The indexOf() and lastIndexOf() methods can be used to check if a string contains another string. Here's a simple example:
javascript string contains
on Jan 01, 1970
const string = "foo",
const substring = "oo";
console.log(string.includes(substring));0
javascript string contains
on Jan 01, 1970
// javascript string contains
var string = "foo",
substring = "oo";
console.log(string.includes(substring));
// javascript string contains
var str = "We got a poop cleanup on isle 4.";
if(str.indexOf("poop") !== -1){
alert("Not again");
}
// javascript string contains
var email = "[email protected]";
if(email.includes("@")){
console.log("Email is valid");
}
else{
console.log("Email is not valid");
}
// javascript string contains
const ParticipantsOfArtExhibition = [
"Jhon",
"Amy",
"Liam"
]
ParticipantsOfArtExhibition.includes("Jhon") //true
ParticipantsOfArtExhibition.includes("Thompson") //false
ParticipantsOfArtExhibition.includes("Amy") //true0
javascript string contains
on Jan 01, 1970
var string = "foo",
var substring = "oo";
console.log(string.includes(substring));0
javascript string contains
on Jan 01, 1970
var email = "[email protected]";
if(email.includes("@")){
console.log("Email is valid");
}
else{
console.log("Email is not valid");
}
// includes return boolean, if your string found => true else => false0
javascript string contains
on Jan 01, 1970
var str = "We got a poop cleanup on isle 4.";
if(str.indexOf("poop") !== -1){
alert("Not again");
}
//use indexOf (it returns position of substring or -1 if not found)0
javascript string contains
on Jan 01, 1970
var string = "foo",
substring = "oo";
console.log(string.includes(substring));0
This is one of JavaScript's more common string methods, but if you need to check if a string contains another string, this should help you get the job done quickly and easily.
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