const arr = [1,1,2,2,4,5,4]; let singles=[]; arr.forEach((el,index,array)=>{ let single=array.filter(element => element === el); if(single.length === 1){ singles.push(single[0]) } });
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const arr = [1,1,2,2,4,5,4];
let singles=[];
arr.forEach((el,index,array)=>{
let single=array.filter(element => element === el);
if(single.length === 1){
singles.push(single[0])
}
});