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- function addTogether(a, b) {
- if(!Number.isInteger(a)) {
- return undefined
- }
- if (b === undefined) {
- return function(b) {
- if(!Number.isInteger(b)){
- return undefined
- }
- return a + b
- }
- } else if (!Number.isInteger(b)) {
- return undefined
- }
- return a + b
- }
- addTogether(2,3);
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