Run results for: Nested loops vs Pick v2

Run details:
User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36 Edg/115.0.1901.200
Browser: Chrome 115
Operating system: Windows
Device Platform: Desktop
Date tested: one year ago
Test name	Executions per second
Array.from + Object.assign	1859.8 Ops/sec
Nested Loops	1500.8 Ops/sec
Looped Pick	3947.7 Ops/sec
Script Preparation code:
var objs = [{"Col1":"Row1Col1", "Col2":"Row1Col2", "Col3":"Row1Col3", "Col4":"Row1Col4", "Col5":"Row1Col5", "Col6":"Row1Col6", "Col7":"Row1Col7", "Col8":"Row1Col8", "Col9":"Row1Col9", "Col10":"Row1Col10", "Col11":"Row1Col11", "Col12":"Row1Col12", "Col13":"Row1Col13", "Col14":"Row1Col14", "Col15":"Row1Col15", "Col16":"Row1Col16", "Col17":"Row1Col17", "Col18":"Row1Col18", "Col19":"Row1Col19", "Col20":"Row1Col20"},{"Col1":"Row2Col1", "Col2":"Row2Col2", "Col3":"Row2Col3", "Col4":"Row2Col4", "Col5":"Row2Col5", "Col6":"Row2Col6", "Col7":"Row2Col7", "Col8":"Row2Col8", "Col9":"Row2Col9", "Col10":"Row2Col10", "Col11":"Row2Col11", "Col12":"Row2Col12", "Col13":"Row2Col13", "Col14":"Row2Col14", "Col15":"Row2Col15", "Col16":"Row2Col16", "Col17":"Row2Col17", "Col18":"Row2Col18", "Col19":"Row2Col19", "Col20":"Row2Col20"},{"Col1":"Row3Col1", "Col2":"Row3Col2", "Col3":"Row3Col3", "Col4":"Row3Col4", "Col5":"Row3Col5", "Col6":"Row3Col6", "Col7":"Row3Col7", "Col8":"Row3Col8", "Col9":"Row3Col9", 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"Col20":"Row38Col20"},{"Col1":"Row39Col1", "Col2":"Row39Col2", "Col3":"Row39Col3", "Col4":"Row39Col4", "Col5":"Row39Col5", "Col6":"Row39Col6", "Col7":"Row39Col7", "Col8":"Row39Col8", "Col9":"Row39Col9", "Col10":"Row39Col10", "Col11":"Row39Col11", "Col12":"Row39Col12", "Col13":"Row39Col13", "Col14":"Row39Col14", "Col15":"Row39Col15", "Col16":"Row39Col16", "Col17":"Row39Col17", "Col18":"Row39Col18", "Col19":"Row39Col19", "Col20":"Row39Col20"},{"Col1":"Row40Col1", "Col2":"Row40Col2", "Col3":"Row40Col3", "Col4":"Row40Col4", "Col5":"Row40Col5", "Col6":"Row40Col6", "Col7":"Row40Col7", "Col8":"Row40Col8", "Col9":"Row40Col9", "Col10":"Row40Col10", "Col11":"Row40Col11", "Col12":"Row40Col12", "Col13":"Row40Col13", "Col14":"Row40Col14", "Col15":"Row40Col15", "Col16":"Row40Col16", "Col17":"Row40Col17", "Col18":"Row40Col18", "Col19":"Row40Col19", "Col20":"Row40Col20"},{"Col1":"Row41Col1", "Col2":"Row41Col2", "Col3":"Row41Col3", "Col4":"Row41Col4", "Col5":"Row41Col5", "Col6":"Row41Col6", "Col7":"Row41Col7", "Col8":"Row41Col8", "Col9":"Row41Col9", "Col10":"Row41Col10", "Col11":"Row41Col11", "Col12":"Row41Col12", "Col13":"Row41Col13", "Col14":"Row41Col14", "Col15":"Row41Col15", "Col16":"Row41Col16", "Col17":"Row41Col17", "Col18":"Row41Col18", "Col19":"Row41Col19", "Col20":"Row41Col20"},{"Col1":"Row42Col1", "Col2":"Row42Col2", "Col3":"Row42Col3", "Col4":"Row42Col4", "Col5":"Row42Col5", "Col6":"Row42Col6", "Col7":"Row42Col7", "Col8":"Row42Col8", "Col9":"Row42Col9", "Col10":"Row42Col10", "Col11":"Row42Col11", "Col12":"Row42Col12", "Col13":"Row42Col13", "Col14":"Row42Col14", "Col15":"Row42Col15", "Col16":"Row42Col16", "Col17":"Row42Col17", "Col18":"Row42Col18", "Col19":"Row42Col19", "Col20":"Row42Col20"},{"Col1":"Row43Col1", "Col2":"Row43Col2", "Col3":"Row43Col3", "Col4":"Row43Col4", "Col5":"Row43Col5", "Col6":"Row43Col6", "Col7":"Row43Col7", "Col8":"Row43Col8", "Col9":"Row43Col9", "Col10":"Row43Col10", "Col11":"Row43Col11", "Col12":"Row43Col12", "Col13":"Row43Col13", "Col14":"Row43Col14", "Col15":"Row43Col15", "Col16":"Row43Col16", "Col17":"Row43Col17", "Col18":"Row43Col18", "Col19":"Row43Col19", "Col20":"Row43Col20"},{"Col1":"Row44Col1", "Col2":"Row44Col2", "Col3":"Row44Col3", "Col4":"Row44Col4", "Col5":"Row44Col5", "Col6":"Row44Col6", "Col7":"Row44Col7", "Col8":"Row44Col8", "Col9":"Row44Col9", "Col10":"Row44Col10", "Col11":"Row44Col11", "Col12":"Row44Col12", "Col13":"Row44Col13", "Col14":"Row44Col14", "Col15":"Row44Col15", "Col16":"Row44Col16", "Col17":"Row44Col17", "Col18":"Row44Col18", "Col19":"Row44Col19", "Col20":"Row44Col20"},{"Col1":"Row45Col1", "Col2":"Row45Col2", "Col3":"Row45Col3", "Col4":"Row45Col4", "Col5":"Row45Col5", "Col6":"Row45Col6", "Col7":"Row45Col7", "Col8":"Row45Col8", "Col9":"Row45Col9", "Col10":"Row45Col10", "Col11":"Row45Col11", "Col12":"Row45Col12", "Col13":"Row45Col13", "Col14":"Row45Col14", "Col15":"Row45Col15", "Col16":"Row45Col16", "Col17":"Row45Col17", "Col18":"Row45Col18", "Col19":"Row45Col19", "Col20":"Row45Col20"},{"Col1":"Row46Col1", "Col2":"Row46Col2", "Col3":"Row46Col3", "Col4":"Row46Col4", "Col5":"Row46Col5", "Col6":"Row46Col6", "Col7":"Row46Col7", "Col8":"Row46Col8", "Col9":"Row46Col9", "Col10":"Row46Col10", "Col11":"Row46Col11", "Col12":"Row46Col12", "Col13":"Row46Col13", "Col14":"Row46Col14", "Col15":"Row46Col15", "Col16":"Row46Col16", "Col17":"Row46Col17", "Col18":"Row46Col18", "Col19":"Row46Col19", "Col20":"Row46Col20"},{"Col1":"Row47Col1", "Col2":"Row47Col2", "Col3":"Row47Col3", "Col4":"Row47Col4", "Col5":"Row47Col5", "Col6":"Row47Col6", "Col7":"Row47Col7", "Col8":"Row47Col8", "Col9":"Row47Col9", "Col10":"Row47Col10", "Col11":"Row47Col11", "Col12":"Row47Col12", "Col13":"Row47Col13", "Col14":"Row47Col14", "Col15":"Row47Col15", "Col16":"Row47Col16", "Col17":"Row47Col17", "Col18":"Row47Col18", "Col19":"Row47Col19", "Col20":"Row47Col20"},{"Col1":"Row48Col1", "Col2":"Row48Col2", "Col3":"Row48Col3", "Col4":"Row48Col4", "Col5":"Row48Col5", "Col6":"Row48Col6", "Col7":"Row48Col7", "Col8":"Row48Col8", "Col9":"Row48Col9", "Col10":"Row48Col10", "Col11":"Row48Col11", "Col12":"Row48Col12", "Col13":"Row48Col13", "Col14":"Row48Col14", "Col15":"Row48Col15", "Col16":"Row48Col16", "Col17":"Row48Col17", "Col18":"Row48Col18", "Col19":"Row48Col19", "Col20":"Row48Col20"},{"Col1":"Row49Col1", "Col2":"Row49Col2", "Col3":"Row49Col3", "Col4":"Row49Col4", "Col5":"Row49Col5", "Col6":"Row49Col6", "Col7":"Row49Col7", "Col8":"Row49Col8", "Col9":"Row49Col9", "Col10":"Row49Col10", "Col11":"Row49Col11", "Col12":"Row49Col12", "Col13":"Row49Col13", "Col14":"Row49Col14", "Col15":"Row49Col15", "Col16":"Row49Col16", "Col17":"Row49Col17", "Col18":"Row49Col18", "Col19":"Row49Col19", "Col20":"Row49Col20"},{"Col1":"Row50Col1", "Col2":"Row50Col2", "Col3":"Row50Col3", "Col4":"Row50Col4", "Col5":"Row50Col5", "Col6":"Row50Col6", "Col7":"Row50Col7", "Col8":"Row50Col8", "Col9":"Row50Col9", "Col10":"Row50Col10", "Col11":"Row50Col11", "Col12":"Row50Col12", "Col13":"Row50Col13", "Col14":"Row50Col14", "Col15":"Row50Col15", "Col16":"Row50Col16", "Col17":"Row50Col17", "Col18":"Row50Col18", "Col19":"Row50Col19", "Col20":"Row50Col20"},{"Col1":"Row51Col1", "Col2":"Row51Col2", "Col3":"Row51Col3", "Col4":"Row51Col4", "Col5":"Row51Col5", "Col6":"Row51Col6", "Col7":"Row51Col7", "Col8":"Row51Col8", "Col9":"Row51Col9", "Col10":"Row51Col10", "Col11":"Row51Col11", "Col12":"Row51Col12", "Col13":"Row51Col13", "Col14":"Row51Col14", "Col15":"Row51Col15", "Col16":"Row51Col16", "Col17":"Row51Col17", "Col18":"Row51Col18", "Col19":"Row51Col19", "Col20":"Row51Col20"},{"Col1":"Row52Col1", "Col2":"Row52Col2", "Col3":"Row52Col3", "Col4":"Row52Col4", "Col5":"Row52Col5", "Col6":"Row52Col6", "Col7":"Row52Col7", "Col8":"Row52Col8", "Col9":"Row52Col9", "Col10":"Row52Col10", "Col11":"Row52Col11", "Col12":"Row52Col12", "Col13":"Row52Col13", "Col14":"Row52Col14", "Col15":"Row52Col15", "Col16":"Row52Col16", "Col17":"Row52Col17", "Col18":"Row52Col18", "Col19":"Row52Col19", "Col20":"Row52Col20"},{"Col1":"Row53Col1", "Col2":"Row53Col2", "Col3":"Row53Col3", "Col4":"Row53Col4", "Col5":"Row53Col5", "Col6":"Row53Col6", "Col7":"Row53Col7", "Col8":"Row53Col8", "Col9":"Row53Col9", "Col10":"Row53Col10", "Col11":"Row53Col11", "Col12":"Row53Col12", "Col13":"Row53Col13", "Col14":"Row53Col14", "Col15":"Row53Col15", "Col16":"Row53Col16", "Col17":"Row53Col17", "Col18":"Row53Col18", "Col19":"Row53Col19", "Col20":"Row53Col20"},{"Col1":"Row54Col1", "Col2":"Row54Col2", "Col3":"Row54Col3", "Col4":"Row54Col4", "Col5":"Row54Col5", "Col6":"Row54Col6", "Col7":"Row54Col7", "Col8":"Row54Col8", "Col9":"Row54Col9", "Col10":"Row54Col10", "Col11":"Row54Col11", "Col12":"Row54Col12", "Col13":"Row54Col13", "Col14":"Row54Col14", "Col15":"Row54Col15", "Col16":"Row54Col16", "Col17":"Row54Col17", "Col18":"Row54Col18", "Col19":"Row54Col19", "Col20":"Row54Col20"},{"Col1":"Row55Col1", "Col2":"Row55Col2", "Col3":"Row55Col3", "Col4":"Row55Col4", "Col5":"Row55Col5", "Col6":"Row55Col6", "Col7":"Row55Col7", "Col8":"Row55Col8", "Col9":"Row55Col9", "Col10":"Row55Col10", "Col11":"Row55Col11", "Col12":"Row55Col12", "Col13":"Row55Col13", "Col14":"Row55Col14", "Col15":"Row55Col15", "Col16":"Row55Col16", "Col17":"Row55Col17", "Col18":"Row55Col18", "Col19":"Row55Col19", "Col20":"Row55Col20"},{"Col1":"Row56Col1", "Col2":"Row56Col2", "Col3":"Row56Col3", "Col4":"Row56Col4", "Col5":"Row56Col5", "Col6":"Row56Col6", "Col7":"Row56Col7", "Col8":"Row56Col8", "Col9":"Row56Col9", "Col10":"Row56Col10", "Col11":"Row56Col11", "Col12":"Row56Col12", "Col13":"Row56Col13", "Col14":"Row56Col14", "Col15":"Row56Col15", "Col16":"Row56Col16", "Col17":"Row56Col17", "Col18":"Row56Col18", "Col19":"Row56Col19", "Col20":"Row56Col20"},{"Col1":"Row57Col1", "Col2":"Row57Col2", "Col3":"Row57Col3", "Col4":"Row57Col4", "Col5":"Row57Col5", "Col6":"Row57Col6", "Col7":"Row57Col7", "Col8":"Row57Col8", "Col9":"Row57Col9", "Col10":"Row57Col10", "Col11":"Row57Col11", "Col12":"Row57Col12", "Col13":"Row57Col13", "Col14":"Row57Col14", "Col15":"Row57Col15", "Col16":"Row57Col16", "Col17":"Row57Col17", "Col18":"Row57Col18", "Col19":"Row57Col19", "Col20":"Row57Col20"},{"Col1":"Row58Col1", "Col2":"Row58Col2", "Col3":"Row58Col3", "Col4":"Row58Col4", "Col5":"Row58Col5", "Col6":"Row58Col6", "Col7":"Row58Col7", "Col8":"Row58Col8", "Col9":"Row58Col9", "Col10":"Row58Col10", "Col11":"Row58Col11", "Col12":"Row58Col12", "Col13":"Row58Col13", "Col14":"Row58Col14", "Col15":"Row58Col15", "Col16":"Row58Col16", "Col17":"Row58Col17", "Col18":"Row58Col18", "Col19":"Row58Col19", "Col20":"Row58Col20"}];

var props = ["Col1","Col2", "Col3", "Col5", "Col7", "Col11", "Col13", "Col17", "Col19"];
var intermediate = [];
Tests:
Array.from + Object.assign
intermediate = Array.from(objs, (thisElement, thisIndex) => ( Object.assign({}, ... props.map(thisProp => ({[thisProp]: thisElement[thisProp]}))) )); var columnExpression = ''; if (props) { for (var i = 0; i < props.length; i++) { if (i > 0) { columnExpression += ','; } columnExpression += '"' + props[i] + '" ' + 'VARCHAR2' + " PATH '$." + props[i] + "'"; } } console.log ("json_table(?, '$[*]' COLUMNS " + columnExpression + ')'); console.log (JSON.stringify(intermediate));
Nested Loops
if (objs) { for (var i = 0; i < objs.length; i++) { intermediate[i] = {}; for (var propId = 0; propId < props.length; propId++) { var propName = props[propId]; if (propName && propName.length) { intermediate[i][propName] = objs[i][propName]; } } } } var columnExpression = ''; if (props) { for (var i = 0; i < props.length; i++) { if (i > 0) { columnExpression += ','; } columnExpression += '"' + props[i] + '" ' + 'VARCHAR2' + " PATH '$." + props[i] + "'"; } } console.log ("json_table(?, '$[*]' COLUMNS " + columnExpression + ')'); console.log (JSON.stringify(intermediate));
Looped Pick
function pick(o, ...props) { return Object.assign({}, ...props.map(prop => ({[prop]: o[prop]}))); } if (objs) { for (var i = 0; i < objs.length; i++) { intermediate[i] = pick(objs[i],props); } } var columnExpression = ''; if (props) { for (var i = 0; i < props.length; i++) { if (i > 0) { columnExpression += ','; } columnExpression += '"' + props[i] + '" ' + 'VARCHAR2' + " PATH '$." + props[i] + "'"; } } console.log ("json_table(?, '$[*]' COLUMNS " + columnExpression + ')');
Preinitialized Looped Pick
function pick(o, ...props) { return Object.assign({}, ...props.map(prop => ({[prop]: o[prop]}))); } intermediate = Array.from({length: objs.length}); if (objs) { for (var i = 0; i < objs.length; i++) { intermediate[i] = pick(objs[i],props); } } var columnExpression = ''; if (props) { for (var i = 0; i < props.length; i++) { if (i > 0) { columnExpression += ','; } columnExpression += '"' + props[i] + '" ' + 'VARCHAR2' + " PATH '$." + props[i] + "'"; } } console.log ("json_table(?, '$[*]' COLUMNS " + columnExpression + ')');
Run results for: Nested loops vs Pick v2

Array.from + Object.assign

Nested Loops

Looped Pick

Preinitialized Looped Pick
