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var a=[2,6,8], b = 4;
var result = [];
//a.forEach(x => result = result.concat(x, new Array(b - 1)));
for(var i = 0; i < a.length; i++){
result = result.concat(a[i], new Array(b - 1));
}
console.log(result);
var a=[2,6,8], b = 4;
var result = [];
a.forEach(x => result = result.concat(x, new Array(b - 1)));
console.log(result);
var a = [2,6,8];
var b = 3;
for (var i = a.length; i > 0; i--) {
a.splice.apply(a,[i,0].concat(new Array(b-1)))
}
alert(a);