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main.js
run
preview
console
function arrayPreviousLess(nums) {
// write code here.
let numArr = [];
for (let i=0; i < nums.length; i++) {
nums[i-1] < nums[i] ? numArr.push(nums[i-1]) : numArr.push(-1);
}
return numArr;
}



/**
* Test Suite
*/
describe('arrayPreviousLess()', () => {
it('shift previous postions from the left to a smaller value or store -1', () => {
// arrange
const nums = [3, 5, 2, 4, 5];

// act
const result = arrayPreviousLess(nums);

// log
console.log("result: ", result);

// assert
expect(result).toEqual([-1, 3, -1, 2, 4]);
});
});
Console
"result: "
,
[
-1
,
3
,
-1
,
2
,
4
]
,
/index.html
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