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Copy pathtransform-array.js
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111 lines (106 loc) · 3.61 KB
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const CONTROLS = {
'--discard-next': true,
'--discard-prev': true,
'--double-next': true,
'--double-prev': true,
}
const SHOW_CONSOLE_LOG = false;
module.exports = function transform(inc_arr) {
if (!(Array.isArray(inc_arr))) {
throw 'Not array';
}
if (SHOW_CONSOLE_LOG) console.log('start program');
if (SHOW_CONSOLE_LOG) console.log('array length', inc_arr.length, 'array:', inc_arr);
/* Я так понимаю задачу упростили, плак плак плак плак ...
for (let i = 0; i < inc_arr.length; i++) {
if (inc_arr[i] in CONTROLS) {
switch (inc_arr[i]) {
case '--double-prev':
if (i > 0) {
inc_arr.splice(i, 1, inc_arr[i - 1])
} else {
inc_arr.splice(i, 1);
i--;
}
break;
case '--double-next':
if (i < (inc_arr.length - 1)) {
inc_arr.splice(i, 1, inc_arr[i + 1]);
} else {
inc_arr.splice(i, 1);
}
break;
}
}
}
for (let i = 0; i < inc_arr.length; i++) {
if (inc_arr[i] in CONTROLS) {
switch (inc_arr[i]) {
case '--discard-prev':
if (i > 0) {
inc_arr.splice(i - 1, 2);
i-=2;
} else {
inc_arr.splice(i, 1);
i-=1;
}
break;
case '--discard-next':
if (i < (inc_arr.length - 1)) {
inc_arr.splice(i, 2);
i--;
} else {
inc_arr.splice(i, 1);
i--;
}
break;
}
}
}
if (SHOW_CONSOLE_LOG) console.log('array length', inc_arr.length, 'array:', inc_arr);
if (SHOW_CONSOLE_LOG) console.log('end program');
*/
let myArr = inc_arr.slice();
for (let i = 0; i < myArr.length; i++) {
if (myArr[i] in CONTROLS) {
switch (myArr[i]) {
case '--double-prev':
if (i > 0) {
myArr[i] = myArr[i-1];
} else {
myArr[i] = null;
}
break;
case '--double-next':
if ((i+1) < inc_arr.length) {
myArr[i] = myArr[i+1];
} else {
myArr[i] = null;
}
break;
case '--discard-prev':
if (i > 0) {
myArr[i] = null;
myArr[i-1] = null;
} else {
myArr[i] = null;
}
break;
case '--discard-next':
if (i < (inc_arr.length - 1)) {
myArr[i] = null;
myArr[i+1] = null;
} else {
myArr[i] = null;
}
i++;
break;
}
}
}
myArr = myArr.filter((el) => el !== null);
if (SHOW_CONSOLE_LOG) console.log('array length', myArr.length, 'array:', myArr);
if (SHOW_CONSOLE_LOG) console.log('end program');
return myArr;
// remove line with error and write your code here
};