string append time complexity

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Append10
str = "";
for (let i = 0; i < 10; ++i) {
  str += "a";
}
ready
Append100_000
str = "";
for (let i = 0; i < 100_000; ++i) {
  str += "a";
}
ready
Append1_000_000
str = "";
for (let i = 0; i < 1_000_000; ++i) {
  str += "a";
}
ready
Append1_000_000str+a
str = "";
for (let i = 0; i < 1_000_000; ++i) {
  str = str + "a";
}
ready

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