javascript check if character exists in string

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Tomas
03 Oct 2016
1var string = "foo",
2    substring = "oo";
3
4console.log(string.includes(substring));
source
Mika
09 May 2017
1// With ES6 MDN docs .includes()
2"FooBar".includes("oo"); // true
3"FooBar".includes("foo"); // false
4"FooBar".includes("oo", 2); // false (2 is the start position for the search)
5
6// E: Not suported by IE - instead you can use the Tilde opperator ~ (Bitwise NOT) with .indexOf()
7~"FooBar".indexOf("oo"); // -2
8~"FooBar".indexOf("foo"); // 0
9~"FooBar".indexOf("oo", 2); // 0 (parameter 2 is the start position for the search)
10
11// Used with a number, the Tilde operator effective does ~N => -(N+1). Use it with double negation !! (Logical NOT) to convert the numbers in bools:
12!!~"FooBar".indexOf("oo"); // true
13!!~"FooBar".indexOf("foo"); // false
14!!~"FooBar".indexOf("oo", 2); // false
Liam
25 Jan 2019
1var str = "We got a poop cleanup on isle 4.";
2if(str.indexOf("poop") !== -1){
3	alert("Not again");
4}
Chrystal
14 Jun 2016
1var string = "foo",
2var substring = "oo";
3
4console.log(string.includes(substring));
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