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fix(5.1):use bit mask and bit operators #80

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Feb 28, 2021
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fix(5.1):use bit mask and bit operators #80

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fix(5.1):use bit mask and bit operators
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@chengjieyun59
chengjieyun59 committed Feb 27, 2021
commit 479e55644ba1f2092fb2f3b7b7a0129d8f8ac80b
19 changes: 8 additions & 11 deletions chapter05/5.1 - Insertion/insertion.js
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Original file line number Diff line number Diff line change
@@ -1,14 +1,11 @@
var insertion = function(N, M, i, j) {
var n = N.split('');
var m = M.split('');
var nlength = n.length - 1;
var mlength = m.length - 1;
for (var a = 0; a < j - i + 1; a++) {
console.log(m[mlength - a]);
n[nlength - (i + a)] = m[mlength - a];
}
return n.join('');
const insertion = (N, M, i, j) => {
const bitMask = (-1 << (j + 1)) | ((1 << i) - 1);
const clearedN = N & bitMask;
const shiftedM = M << i;
return clearedN | shiftedM;
};

/* TEST */
console.log(insertion('10000000000', '10011', 2, 6), '10001001100');
const N = parseInt(10000000000, 2);
const M = parseInt(10011, 2);
console.log(insertion(M, N, 2, 6).toString(2), 10001001100);