x = []
for(i = 0; i < 5; i++)
x.push(i)
x = []
for(i = 0; i < 5; i++)
x[i] = i
x = [...Array(5).keys()]
y = Array.from(x, e=>e*2)
y = x.map(e=>e*2)
x = []
for(i = 0; i < 5; i++)
x.push(i)
x = []
for(i = 0; i < 5; i++)
x[i] = i
x = [...Array(5).keys()]
y = Array.from(x, e=>e*2)
y = x.map(e=>e*2)
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