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range = (from, to, a = []) => {
/* generate a range : [from, from+1, ..., to-1, to] */
for (from; from <= to; a.push(from++));
return a;
}
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// Python:
for i in range(0, 3):
print(i)
// JavaScript:
for ( i in Array.from({ length: 3 }) )
console.log(i)