showing results for - "what is indexof in javascript"
Matthew
02 Apr 2017
1//indexOf getting index of array element, returns -1 if not found
2var colors=["red","green","blue"];
3var pos=colors.indexOf("blue");//2
4
5//indexOf getting index of sub string, returns -1 if not found
6var str = "We got a poop cleanup on isle 4.";
7var strPos = str.indexOf("poop");//9
Adrián
29 Aug 2019
1//indexOf - JS method to get index of array element. 
2// Returns -1 if not found
3
4var colors=["red","green","blue"];
5var pos=colors.indexOf("blue");//2
6
7//indexOf getting index of sub string, returns -1 if not found
8
9var str = "We got a poop cleanup on isle 4.";
10var strPos = str.indexOf("poop");//9
11
12//Eg with material ui
13
14<Checkbox
15   checked={value.indexOf(option) > -1}
16   value={option}
17/>
Juan David
25 Apr 2017
1
2var str = "Please locate where 'locate' occurs!";
3
4var ind1 = str.indexOf("locate"); // return location of first value which founded
5var ind2 = str.lastIndexOf("locate"); // return location of last value which founded
6var ind3 = str.indexOf("locate", 15); // start search from location 15 and then take first value which founded
7var ind4 = str.search("locate");
8//The search() method cannot take a second start position argument. 
9//The indexOf() method cannot take powerful search values (regular expressions).
10
11document.write("<br>" + "Length of string:", len);
12document.write("<br>" + "indexOf:", ind1);
13document.write("<br>" + "index of last:", ind2);
14document.write("<br>" + "indexOf with start point:", ind3);
15document.write("<br>" + "search:", ind4);
Leonardo
06 May 2016
1a = [
2  {prop1:"abc",prop2:"qwe"},
3  {prop1:"bnmb",prop2:"yutu"},
4  {prop1:"zxvz",prop2:"qwrq"}
5];
6    
7index = a.findIndex(x => x.prop2 ==="yutu");
8
9console.log(index);
Lana
23 Feb 2017
1var hello = {
2    hello: 'world',
3    foo: 'bar'
4};
5var qaz = {
6    hello: 'stevie',
7    foo: 'baz'
8}
9
10var myArray = [];
11myArray.push(hello,qaz);
12
13var indexOfStevie = myArray.findIndex(i => i.hello === "stevie");
14
Valentino
20 Jun 2019
1how to use index
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