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Original
2026-01-01
Modified
2026-03-09
1
<p>Not only numbers can be written in square brackets. Any expression can be formatted this way. In the end, this expression will be converted to a number.</p>
1
<p>Not only numbers can be written in square brackets. Any expression can be formatted this way. In the end, this expression will be converted to a number.</p>
2
<p>Let’s practice this way of accessing array elements and alternate them with the same variable. To do this, you need to get a variable to store the current index of the array element. Let’s call it index and write the initial zero value in it.</p>
2
<p>Let’s practice this way of accessing array elements and alternate them with the same variable. To do this, you need to get a variable to store the current index of the array element. Let’s call it index and write the initial zero value in it.</p>
3
<p>If you now log the expression usersByDay[index] in the console, we’ll see the first value of the array. After all, now the variable holds zero, and the expression usersByDay[index] is equivalent to usersByDay[0].</p>
3
<p>If you now log the expression usersByDay[index] in the console, we’ll see the first value of the array. After all, now the variable holds zero, and the expression usersByDay[index] is equivalent to usersByDay[0].</p>
4
<p>If you change the value of the variable index from zero to one and access usersByDay[index] again, we’ll then get an element with the index 1, that is, the second element.</p>
4
<p>If you change the value of the variable index from zero to one and access usersByDay[index] again, we’ll then get an element with the index 1, that is, the second element.</p>
5
<p>Look, the expression in brackets in both cases is the same: usersByDay[index]. But it returns different values for different conditions.</p>
5
<p>Look, the expression in brackets in both cases is the same: usersByDay[index]. But it returns different values for different conditions.</p>
6
<p>If we continue to increase index and read elements of the array usersByDay, then sooner or later we will go through all the elements.</p>
6
<p>If we continue to increase index and read elements of the array usersByDay, then sooner or later we will go through all the elements.</p>