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JavaScript

Posted by Junior Aidee
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Junior Aidee
Front End Web Development Techdegree Graduate 14,657 Points

Clarification on the i variable

for( let i = 0; i < questions.length; i++ ) { let answer = questions[i][1]; }

It looks the i variable both represents a counter for the correct answers as well as the outer array. What does the i variable really represent in this instance? Please clarify.

Justyna Szofinska
Justyna Szofinska
6,178 Points
Justyna Szofinska
Justyna Szofinska
6,178 Points 
const grades = [
     [10,20,30,40],
     [50,60,70,80],
     [90,100,110,120]
];

You treat multiple array like a table which have rows and columns. To specify the value you need to give two informations. The first information (which represent "i" in the loop) is the number of column. The second is a number in the row. For example, "40" belongs to 0 column (because we start count from 0) and 3 row, which mean [0][3]. When you create variable for the column number like [i][3], number column will change but number of rows are constant.

I hope that I helped a little.

1 Answer

Junior Aidee
.a{fill-rule:evenodd;}techdegree seal-36
Junior Aidee
Front End Web Development Techdegree Graduate 14,657 Points

It makes a lot more sense now. Thank you very much, Justyna!