get last item in map javascript
row.map((rank, i, arr) => {
if (arr.length - 1 === i) {
// last one
} else {
// not last one
}
});get last item in map javascript
row.map((rank, i, arr) => {
if (arr.length - 1 === i) {
// last one
} else {
// not last one
}
});Get the last item of Array Set Map object js
const lastItem = (list) => {
if (Array.isArray(list)) {
return list.slice(-1)[0];
}
if (list instanceof Set) {
return Array.from(list).slice(-1)[0];
}
if (list instanceof Map) {
return Array.from(list.values()).slice(-1)[0];
}
if (!Array.isArray(list) && typeof list === "object") {
return Object.values(list).slice(-1)[0];
}
throw Error(`argument "list" must be of type Array, Set, Map or object`);
};
// Usage
const l1 = lastItem(["a", "b", "c"]);
// c
const l2 = lastItem(new Set(["d", "e", "f"]));
// f
const l3 = lastItem(
new Map([
["a", "x"],
["b", "y"],
["c", "z"]
])
);
// z
const l4 = lastItem({ a: "x", b: "y", c: "z" });
// zCopyright © 2021 Codeinu
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