I have an array of elements containing iPhone models and 4 values that come after it, like this:
const arr = ['ip6s+', '35', '15', '10', '10', 'ip7', '40', '20', '15', '15']
I want to turn this into an object that looks like this:
const Obj = {
'ip6s+': ['35', '15', '10', '10'],
'ip7+' : ['90', '60', '35', '30']
}
Where the first object is the phone model and every fourth is its values. How to do that?
You can use slice:
const arr = ['ip6s+', '35', '15', '10', '10','ip7', '40', '20', '15','15'];
const obj = {};
const n = 4; // the number of values after the model name
for (var i = 0; i < arr.length; i += n + 1) {
obj[arr[i]] = arr.slice(i + 1, i + n + 1);
}
console.log(obj);
[model1, v1, v2, v3, v4, ...]), since the OP didn't mention any more information.
You could also use reduce()
const arr = ['ip6s+', '35', '15', '10', '10','ip7', '40', '20', '15','15']
let lastCurr = null;
const result = arr.reduce( ( res, curr, ix ) => {
if( 0 == ix % 5 ){
res[ curr ] = [];
lastCurr = curr;
}else
res[ lastCurr ].push( curr );
return res;
}, {} )
If your keys are always supposed to be isNaN and first value always corresponds to key, than you can do something like this, this will be more dynamic in case there are dynamic number of elements between two keys
const arr = ['ip6s+', '35', '15', '10', '10', 'ip7', '40', '20', '15', '15']
let getDesiredFormat = (arr) => {
let currentKey = arr[0]
let final = arr.reduce((op, inp) => {
if (isNaN(inp)) {
op[inp] = []
currentKey = inp
} else {
op[currentKey].push(inp)
}
return op
}, {})
return final
}
console.log(getDesiredFormat(arr))If the array starts with an item that starts with "ip" and starting with that is the trigger for a new key in the object, you could use startswith.
This allows a variable number of items after ip.
const arr = ['ip6s+', '35', '15', '10', '10', 'ip7', '40', '20', '15', '15'];
const obj = {};
let currKey = arr.slice(0, 1);
arr.forEach(s => s.startsWith("ip") ? (currKey = s, obj[s] = []) : obj[currKey].push(s));
console.log(obj);Use slice method, also the following example should work no matter how many elements in the array :
this should work also if there are elements before
'ip6s+'BUT the'ip6s+'must always precede'ip7'.
const arr = ['some', 'elemnts', 'in', 'front', 'ip6s+', '35', '15', 'abc', '80', '58', '10', '10', 'ip7', '40', '20', '15', '15', '100', 'xyz'],
l = arr.length,
ip6sIndex = arr.indexOf('ip6s+'),
ip7Index = arr.indexOf('ip7'),
obj = {};
obj[arr[ip6sIndex]] = arr.slice(ip6sIndex + 1, ip7Index); /** get the items after 'ip6s+' **/
obj[arr[ip7Index]] = arr.slice(-(l - ip7Index) + 1); /** get the items after 'ip7' **/
console.log(obj);