I have an object like:
item: {
b: null
c: "asd"
i: 10
q: 10
s: Array [237,241]}
Also I have an array of ids:
var ids = [237, 238, 239, 240, 242, 243...]
I dont know how to check if above ids exist in s, and then save those items to new array or object
for (var key in items) {
for (var i in items[key].s) {
//...
}
}
if(items.s.some(el => ids.includes(el))) alert("wohoo");
Simply check if some of the items ids is included in the ids array. Or using a for loop:
for(var i = 0; i < items.s.length; i++){
if( ids.includes( items.s[i] )){
alert("wohoo");
}
}
You can use Array.filter and Array.indexOf. I assume that you are not using any code transpiler, si I recommend using indexOf instead of includes as it has better browser support.
var foundIds = item.s.filter(x => ids.indexOf(x) !== -1);
// foundIds now contains the list of IDs that were matched in both `ids` and `item.s`
var item = {
b: null,
c: "asd",
i: 10,
q: 10,
s: [237,241]
}
var ids = [237, 238, 239, 240, 242, 243];
var foundIds = item.s.filter(x => ids.indexOf(x) !== -1);
console.log(foundIds);
.includes() due to it not being well supported, but then use an arrow function. The main thing that you would be trying to gain by not using .includes() would be IE support. IE doesn't support arrow functions either.
.inlcudes(). However, Array.prototype.includes() was supported in Edge as of version 14. Thus, the primary thing one gets by not using .includes() is IE support, for which you must also not use arrow functions.arrow functions are from ES2015 and .includes() are from ES2016. I don't know the exact browser support, but I guess on mobile the difference is pretty large. Also, you are right, using arrow functions while mentioning the browser support issue was a bit ironic.
var item = {
b: null,
c: "asd",
i: 10,
q: 10,
s: [237,241]
}
var ids = [237, 238, 239, 240, 242, 243];
// way number 1
for(var i = 0; i < item.s.length; i++){
if( ~ids.indexOf(item.s[i])){
console.log(item.s[i]);
}
}
//way number 2
var myArr = item.s.filter(x => ~ids.indexOf(x));
console.log(myArr);
indexOforincludes