I want to fetch a particular value from a javascript string without using methods like indexOf or substr. Is there any predefined method of doing so?
For e.g., I have a string,
var str = "a=1|b=2|c=3|d=4|e=5|f=6";
I want to fetch the value of c from above string, how can I achieve it directly?
You can try with:
str.split('|').find(value => value.startsWith('c=')).split('=')[1]
You can also convert it into an object with:
const data = str.split('|').reduce((acc, val) => {
const [key, value] = val.split('=');
acc[key] = value;
return acc;
}, {});
data.c // 3
In this case, use split:
var str = "a=1|b=2|c=3|d=4|e=5|f=6";
var parts = str.split('|');
var value = parts[2].split('=')[1];
console.log(value);Or maybe map it, to get all values to work with afterwards:
var str = "a=1|b=2|c=3|d=4|e=5|f=6";
var values = str.split('|').map(e => e.split('='));
console.log(values);Using regex can solve this problem
const str = "a=1|b=2|c=3|d=4|e=5|f=6";
const matches = str.match(/c=([0-9]+)/);
console.log(matches[1]);Ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/match
Try this -
var str = "a=1|b=2|c=3|d=4|e=5|f=6";
str.split('|')[2].split('=')[1];
You could turn that string into an associative array or an object
var str = "a=1|b=2|c=3|d=4|e=5|f=6";
var obj = {}; //[] for array
str.split("|").map(o => {
var el = o.split("=");
obj[el[0]] = el[1];
})
console.log(obj.a)
console.log(obj.b)
console.log(obj.c)I suggest first splitting and mapping into some form of readable data structure. Finding by string is vulnerable to typos.
const mappedElements = str
.split('|')
.map(element => element.split('='))
.map(([key, value]) => ({ key: value }));
Array filter method can be memory efficient for such operation.
var cOutput = str.split('|').filter( (val) => {
const [k,v] = val.split('=');
return k=='c' ? v : false }
)[0].split('=')[1];
See Array Filter
