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transform-array.js
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39 lines (37 loc) · 846 Bytes
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const CustomError = require("../extensions/custom-error");
module.exports = function transform(arr) {
if (!Array.isArray(arr)) {
throw new Error();
}
const newArr = [];
for (let i = 0; i < arr.length; i++) {
switch (arr[i]) {
case '--double-next':
if (i < arr.length - 1) {
newArr.push(arr[i + 1]);
}
break;
case '--double-prev':
if (i > 0) {
newArr.push(arr[i - 1]);
}
break;
case '--discard-next':
if (arr[i + 2] === '--double-prev' || arr[i + 2] === '--discard-prev') {
i += 2;
} else {
i++;
}
break;
case '--discard-prev':
if (i > 0) {
newArr.pop();
}
break;
default:
newArr.push(arr[i]);
break
}
}
return newArr;
};