javascript indexOf object value in array
// Get index of object with specific value in array
const needle = 3; // needle
const haystack = [{ id: 1 }, { id: 2 }, { id: 3 }]; // haystack
const index = haystack.findIndex(item => item.id === needle);javascript indexOf object value in array
// Get index of object with specific value in array
const needle = 3; // needle
const haystack = [{ id: 1 }, { id: 2 }, { id: 3 }]; // haystack
const index = haystack.findIndex(item => item.id === needle);using index of on array of objects
arr = [{x: "a", y: 1}, {x: "something", y: 2}]
arr.findIndex(obj => obj.x === "a" && obj.y === 1);javascript indexof
//indexOf getting index of array element, returns -1 if not found
var colors=["red","green","blue"];
var pos=colors.indexOf("blue");//2
//indexOf getting index of sub string, returns -1 if not found
var str = "We got a poop cleanup on isle 4.";
var strPos = str.indexOf("poop");//9indexof javascript
var str = "Please locate where 'locate' occurs!";
var ind1 = str.indexOf("locate"); // return location of first value which founded
var ind2 = str.lastIndexOf("locate"); // return location of last value which founded
var ind3 = str.indexOf("locate", 15); // start search from location 15 and then take first value which founded
var ind4 = str.search("locate");
//The search() method cannot take a second start position argument.
//The indexOf() method cannot take powerful search values (regular expressions).
document.write("<br>" + "Length of string:", len);
document.write("<br>" + "indexOf:", ind1);
document.write("<br>" + "index of last:", ind2);
document.write("<br>" + "indexOf with start point:", ind3);
document.write("<br>" + "search:", ind4);indexof javascript
//indexOf - JS method to get index of array element.
// Returns -1 if not found
var colors=["red","green","blue"];
var pos=colors.indexOf("blue");//2
//indexOf getting index of sub string, returns -1 if not found
var str = "We got a poop cleanup on isle 4.";
var strPos = str.indexOf("poop");//9
//Eg with material ui
<Checkbox
checked={value.indexOf(option) > -1}
value={option}
/>indexof object javascript
var hello = {
hello: 'world',
foo: 'bar'
};
var qaz = {
hello: 'stevie',
foo: 'baz'
}
var myArray = [];
myArray.push(hello,qaz);
var indexOfStevie = myArray.findIndex(i => i.hello === "stevie");Copyright © 2021 Codeinu
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