Benchmark: String Concatenation between string append, push & join and assign & join

Script Preparation code:

var str1 = "", 
    str2 = "", 
    str3 = "", 
    sArr1 = [],
    sArr2 = new Array(500);

Tests:

standard string append
for (var i = 0; i < 500; i++) { str1 += "String concatenation. "; }
array push then join
for (var i = 0; i < 500; i++) { sArr1.push("String concatenation. "); } str2 = sArr1.join("");
array index assign then join
for (var i = 0; i < 500; i++) { sArr2[i] = "String concatenation. "; } str3 = sArr2.join("");

Rendered benchmark preparation results:

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Related benchmarks:

String Concatenation between string append, push & join and assign & join (version: 0)