let arr = [{ a: 1, b: 2 }, { a: 3, b: 4 }, { a: 3, b: 5 }, { a: 3, b: 6 }]
function firstGrayIndex(array) {
let index = array.reverse().findIndex((item, index) => {
return item.a === 3;
});
if (index === -1) return;
return array.length - 1 - index;
}
console.log(firstGrayIndex(arr));
查找对象中的
let obj = {
a: 1,
b: 0,
c: 5,
d: 6,
e: 0,
f: 0,
g: 0,
};
let arr = Object.values(obj);
function firstGrayIndex(array) {
let index = array.reverse().findIndex((item, index) => {
return item > 0;
});
if (index === -1) return;
return array.length - 1 - index;
}
console.log(firstGrayIndex(arr));